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STANDARD ANNUAL REPORT ON PRODUCTIONFACILITY CHANCES, TESTS AND EXPERIMENTS.

AS REQUIRED BY 10 CFR50.59b

Facility Changes -

MAR 76-9-3, completed 9/6/77Replacement of thermomagnetic circuit breakers in the 3A1, 3A2, 3B1,3H2 and 3AB ES MCC's with equivalent breakers rated at 50*C. Originalbreakers were rated at 40*C, however, Requirement Outline permits upto the 50*C rating.

MAR 76-10-1, completed 9/6/77_ ,

Fabricate and install valve stem in MUV-49 (Letdown Cooler IsolationValve). -Original stem is bent and replacement part is not readily-available. Fabricated stem is from originally specified material andnecessary material makeup was verified.

MAR 76-10-10, completed 9/6/77

Cut 1" controlled bleedoff piping of RCP-3A2 and add flange connectionsin order to expedite the removal and installation of RCP-3A2. Thismodification was designed and constructed to original codes and is forease of maintenance only.

MAR 76-10-13, completed 10/14/77Cut NSCCC piping and. install permanent flange connections in order toexpedite the removal of RCP-3A2. This modification was designed andconstructed to original construction codes and is ' for ease of mainten-ance only.

MAR 76-11-3, completed 10/14/77Installation of 1/2" tubing to existing double isolated pressure taps ofthe RC system in order to obtain Reactor Coolant Pump differential pres-sure during pump operations. Failure of tubing would not cause collantleakage in excess of makeup capabilities.

:MAR 76-11-9, completed 9/6/77

Installation of metal to metal seat conversion kits for specified solenoidvalves in the CA, MU, and CF systems and lower disc stem clearance check

of nine valves in the RM system. This modification is in r,esponce to NRC-IEB 75-03. -

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MAR 76-11-13, completed 10/14/77Rotate the orientation of BSV-3 and BSV-4 so that the inlet and outlet arereversed in order to eleminate cavitation which' occurs at flows lower than1350 gpm. This modification improves _the operation and effectiveness ofthe system.

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MAR 76-11-16, completed 9/6/77-Replace 3.3K resistor with 6.8K resistor in the remote meter assembly-of RMG-19 in oefer to get remote indication to agree with local indi-ca t ion .' .This moolfication ensures accurate indication in the controlroom.

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MAR 76-11-17,- completed 9/6/77Revise setpoints of P & S 55, 68, 69, EP & ES-1, 5 and 9 in order to-achieve proper temperature levels. Revise temperature alarm setpointsof IITRT-1. through 6 to avoid nuisance alarms. Replace defective equip-ment for EP & ES 18. This modification does not reduce ~the effect oroperation of the equipment.

MAR 76-11-23, completed 10/14/77Reorient or extend reservoirs on 4 and 5 inch bore snubbers of all FPC -piping systems in order to correct for a situation where reservoirs areslightly lower than snubber cylinders. This corrects an undesirablesituation and allows units to function as designed. .

MAR 76-12-6, completed 9/6/77Installation of corrosive resistatt bushings in the solenoid linkageof RCV-10 (pressurizer electro-magnetic relief valve) in order to ensurefreedom of movement and to decrease the probability of equipment malfunc-tion.

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MAR 76-12-12, completed 9/6/77Remove snubbers from RC pressure transmitters RC-3B-PT 1 through 3; RC-3A-PT 1 through 4, RC-131/132-PT in order to improve the response of thesetransmitters. There are no requirements for snubbers on RC pressure trans-mitters and the sensitivity of the transmitter is improved with thesedevices removed.

MAR 76-12-21, completed 12/2/77Fabrication and installation of a support bracket on vertical run of pipefrom discharge of MUV-137 between makeup tank and MUV-64 at an elevationof 96 feet. Installation of the support bracket improves the desigh ofthe system by reducing the chance of line damage or breakage.

~~MAR 76-12-22, completed 10/18/77Add a key lock selectable low range setpoint for operation of RCV-10(pressurizer electromagnetic relief valve). This will prevent accidentaloverpressurization of RC system above NDT limits during plant heatup andcooldown.

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MAR 76-12-22ATo revise externa 1' connections of NNI system wiring to be compatible withinternal.B & W wire, in order to connect interface as shown on original

MAR 76-12-22. This action was taken in response to NRC investigation ofa generic problem of overpressurization of the RC system during startupand shutdown operations. *

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MAR 76-12-25, completed 9/6/77Add. flanges to'the waste disposal vent line.between DHP-B and DWV-30and to the gland seal water line between the pump and Di[V-100 to allowfor ease of removal of DHP-B. The modification is built to original- construction codes and will not degrade the operation and safety of .-the system.

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MAR 76-12-27, completed 9/6/77Notification of 'an Indication in the shaf t keyway on DilP-B and a crack

in the carbon face of the mechanical seal. It was determined-that pumpoperability was not in jeopardy. The unit was reassembled and put hackin service until a new replacement shaft was received and installedat a later date.

FMR 76-12-28, completed 9/6/77~

Change feed for Channel 2A cabinet on CAI print 208-028SE ESA-21 fromVBDP 4 BKR 1 to VBDP 5 BKR 1. This corrects an error on this print whichreflects actual plant design conditions. *

MAR 76-12-29, completed 9/6/77Delete low range flow control on BSV 3 and 4. Flow control in recir-culation mode with DHV-42/43 open will be an operator responsibility.This modification permits the operator to have some control withoutreducing the capabilities and operation of the Building Spray System.

MAR 76-12-37, completed 9/6/77Replace existing heat trace cable of sections EP and ES 3c, 4c, 11cand 12c in order to provide for lower temperatures on these circuits.This modification will improve the operation of these systems.

}MR 77-1-8, completed 9/6/77Replace the 1 1/2" air connection at Reactor Building penetration #341, .spool piece B.S.67 with 8" pipe. A through wall crack was found in theheat effected zone. Alternate methods of conducting the 5 year flowtests for the Building Spray System exist. The integrity and safety ofthe system is increased.

MAR 77-1-17, completed 11/8/77 :Install 1 1/2" diaphram valve in the line between WDT-9 and strainerWDS-1 and increase mesh size on WDS-1 'to 3/16" or 1/4". This permitsthe removal of WDS-1 for cleaning without draining WDT-9. The mesh sizereduces cleaning requirements. The operation and integrity of systemis not reduced.

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MAR 77-1-24, completed- 10/14/77Install 1/2" Whitey valves in the leakoff piping of specified valves ofthe Dit & MU systems. In the event that valve packings blow from any ofthese valves, system leakage will be contained by these insolation valves.

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MAR 77-1-27,' completed 10/17/77Add Concentrated 7aste and Boric Acid Return lines .to the Miscellaneous

. Waste and RC evaporators-and-install diaphram valves from spare parts~ tagged as WDV-877 and 878. 'The main benefit of this modification is

.the ability to reprocess low concentration tank inventory. The normal.~

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operation of the system is not effected while its flexibility.is incredsed.

MAR 77-2-10, completed 10/17/77Install a 1.38" orifice in the 3" flanges of NSCCC System at inlet to CRDcoolers and revise calibration of SU-90 and 91-FT. This modificationreduces the load on the NSCCC pumps and will increase its lift. Propercooling of the CRD's is monitored by outlet coolant temperature indicationand alarms.

MAR 77-2-30, completed 10/14/77 -Change setpoints of DO-47/48-PS from 25 psig to 15 psig in order to elim-inate the DO pumps drawing suction from the SW system rather than D0 tank.

} This permits the system to operate as originally designed.,

MAR 77-3-9,-completed 11/14/77Replace Westinghouse Pressure Transmitters type 59PH with 'Rosemont Trans-mitters per a finding of "significant deficiency" by B & W. Effectedtransmitters are RC-3A-PT 1 and 2, RC-3B-PT 1 and 2 and RC-132-PT. Thereplacement of these pressure transmitters upgrade the installed system tomeet the original design requirements.

I MAR 77-4-6, completed 9/6/77Modify Steam Hammer Restraints MSH-227 and MSH-232 as per CAI redesign dueto concrete pedestal cracking during testing of MS System (TP-800-25). Theredesign will increase the safety of the system by insuring required re-straint capabilities.

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l- MAR 77-5-9, completed 10/17/77,

| Change the power feed for the Load Control Telemetry Cabinet from Vital'

Bus 3B-panel VBDP-A to Regulated Instrument Bus 3B-panel VBDP-2 in orderto' resolve an underfrequency situation due to problems with Vital Bus 3B.Both panels were designed for the additional capacity. Operation of theequipment will not be affected.

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MAR 77-6-17, completed 10/17/77Revise Elementary Diagram B-208-032, FW-47 revision 5 to correct for anincorrect terminal point reference. Drawing change only.

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MAR 77-8-24, completed 11/14/77 .Add calibrating resistors to Rosemont Pressure Transmitters RC-3A-PT 1 and2, RC-3B-PT 1 and 2 and RC-132-PT to facilitate field calibration. Theseresistors aid in the calibration of the pressure transmitters but do noteffect their operation.

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TESTS AND EXPEitIEENTS_.v

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