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:.c .bTICHEM, INC - b ~ 5 '/'#ClN'

a wholly owned subsidiary of

Medi-Physics, Inc. P.O. BOX B16. *ruXEDO. NEW YORK 10907 1914)351-2131

May 21, 1990

Mr. Steven ZobelNew York State Department of

Environmental Conset ation50 Wolf RoadAlbany, NY 1223.1

,

Dear Mr. Zobel:

REFERENCES:. (a) NYSDEC Letter Dated May 17, 1990(b) NYSDEC Letter. Dated May 18, 1990

This letter is in response to the above referenced lettersconcerning our plans and procedures for diverting . surface

drainage water away from the retention pond during heavy

rainfall.

The enclosed revised procedures, EP-18 and EP-19,- the drawing of -' the storm drain at S-7, and the photographs of the diversionpoint at S-7 are submitted in response to your_ questionscontained in reference (a).' Reference (b ) poses questions about how the decision will be madeto divert the water and what limit will be maintained on thewater level in the retention pona. The water level in the-

retention pond is managed accordirs to weather conditions.During dry weather, the water is sampled for analysis of

radionuclide concentration when the level in the pond reaches 25"and.the' pond is pumped to the 001 outfall when the assay resultsare - known and the water is within acceptable limits. During

rainy weather, the water is sampled for analysis when the levelin the pond reaches 20" and the pond is pumped to the 001 outf allwhen the assay results are known. The actual level of the_ waterin the pond at the time the ' assay result is received depends uponthe precipitation rate. If precipitation is heavy, continuouspumping of the pond will be initiated at which -time the level inthe pond is monitored and hourly samples of the pond and S-7 areanalyzed for radionuclides. If continuous pumping cannot keep upwith the inflow to the retent. ion pond and the level reaches 40",management will be notified and the water at S-7 will be divertedbefore the level reaches 45" on the retention pond gauge.

9006050420 900521PDR ADOCK 05000054 ;

F PDC

t.JJM/109 90B.

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E.

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NEW YORK STATE ?>EPT. OP. ENVIRONMENTAL PROTECTIONMAY 21, 1990PAGE 2

hThese procedures, short of the S-7 diversion, have been- ef fectiveto date without experiencing an adverse affect on the integrityof the dam. If we start diverting S-7 at a lower level, we ibelieve that diversion will occur more frequently than it isnecessary.

Very truly yours,

f v!_N: /rMGJ. . McGovernPlant Manager

1

JJMcG/bjc

Enclosures'4CDrVr:1 Bores?,-l.NRC Jcc: -

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~JJM/109.90B ,

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. . . ..

a,

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EMERGENCY PROCEDURE - HEAVY RAIN ALERT EP-18.

A. OBJECTIVE:

It is possible that excessive rainf all could cause the 001drail. age pipe flow capacity to be exceeded and ultimatelycould lead to the failure of the retention pond dam. Thiscondition could be ' avoided if surf ace drainage water f romthe southern part of the property could be diverted awayfrom the retention pond at S-7.

B. PROCEDURE:

The procedure for emergency diversion of surface drainagewater from S-7 to the reservoir is ac follows:

The Environmental Group of the Health, Saf ety and- Environ-mental Affairs De par tment will monitor weather forecasts.If heavy rains are predicted (> 1" per. hour ) , a heavy rainalert condition shall be established.

During heavy rain alerta:

1. Environmental person on duty or on call shall notifyReactor Operations and Boiler House Operator of possibleheavy.- rain.

.

2. S-7 water shall be sampled and analyzed forradionuclides at 12 hour intervals.

3. When continuous pumping from retention pond isinitiated, S-7 and S-12 shall be sampled and analyzedhourly .in preparation for ' diversion of S-7 water fromthe retention pond.

,

4. The Reactor Operator shall note the level of any waterin the primary water storage tank and monitor the= tanklevel gauge every hour . (Log entries shall be made ofhourly readings). If there is any unexplained change inthe level it shall be considered an Unusual Event underthe Emergency Plan and appropriate notifications shallbe made.

5. If, while in the continuous pumping mcdo due to heavyrainfall, the water level in the retention pond cannot.be maintained below 45" on the gauge, S-7 shall bediverted away from the retention pond. (Refer toprocedure EP-19-for diverting S-7 from retention pond).

,

6. S-7 water shall be sampled and analyzed hourly forpresence of radionuclides during the time that S-7 isdiverted away from the retention pond.

7. When precipitation has abated, S-7 water will be'

redirected to the retention pond as soon as it ispractical.

,

EP-18-0105-18-90

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* EMERGENCY PROCEDURE - S-7 EMERGENCY DIVERSION PROCEDURE EP-19,

-..

A. OBJECTIVE:.,_

To divert a major, portion of S-7 flow to the reservoir inthe event that storm water flow emergency - circumstancesarise under which reliance on the approved method for-emptying the retention pond will not enable preservation ofthe physical integrity of the retention pond or storm waterin-flow to the retention pond exceeds 700 GPM.

B. PROCEDURE

1. Call DEC and send FAX and notify NRC within one hourafter initiating the diversion of S-7.

2. Remove sand bags f rom diversion trench.

3. Insert wood baffle into guides.

4. Monitor the flow into pond. If the pump capacity isstill- exceeded, add more baffles. Continue to addbaffles until the flow into the pond is manageable withthe existing pumping system.

5. Monitor pond level after storm and remove baffles _ whenpumps can maintain the water level at 20" in theretention pond. (Reverse the process in Step 4).

6. Once the water level drops below diversion trench, filltrench with sand bags.

7. Inspect diverter guides, trench and run off area tocheck-for damage.

8. Within one hour after stopping diversion of S-7 watercall and FAX DEC, call NRC.

!|

EF-19-01 1

05-18-90

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