ML20009D726

LER 81-043/03L-0:on 810610,discovered That Spent Fuel Pool Exhaust Fans Did Not Maintain Required Negative Pressure. Caused by Inability of Area Exhaust Fans to Maintain Required Pressure W/Supply Fan Operating

ML20009D726
Person / Time
Site:	Calvert Cliffs
Issue date:	07/10/1981
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009D723	List: ML20009D720 ML20009D726
References
LER-81-043-03L, LER-81-43-3L, NUDOCS 8107240294
Download: ML20009D726 (2)

Text

NRC FORM 36G U. S. NUCLEAR phiULATORY COMMISSION (7 771 +

,i s LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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(PLE ASE PRINT OR TYPE ALL F.EQUIRED INFORMATIONI l0 l1l8 9l M l LICENSEE 7

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J3 34 35 36 40 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ITTO5-1 1 It has been detennined that SFP area exhaust fans cannot maintain the I li lii i required negative pressure with an area supply fan operatina. Sucolv I

, 2 I fan control switches have been tagged to orevent fan use. Fuel Handling 1 lil3ll Procedures will be revised to preclude supply fan use while handling l i 4 I fuel. A system design /T.S. review action has been initiated. I 7 8 9 80 ST S  % POWER OTHER ST ATUS ISCO R DISCOVERY DESCRIPTION W [EJ@ ll '10 l0 l@ln NA l lasAl@l46 Routine Test [

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LER NO. 81-43/3L DOCKET NO. 50-317 LICENSE NO. DPR-53

. EVENT DATE 06-10-81 REPORT DATE 07-10-81 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

'While conducting Surveillance Test Procedure (STP) M-542-0, an out of specification negative pressure was found to exist for the SFP area. ~~ie reason for the low negative

. pressure was determined to be the operation of #11 SFP area supply fan. When the fan was secured, satisf actory readings were attained when each SFP area exhaust fan was 1 operated. No's 11 and 12 SFP area supply fans control switches were immediately tagged to preclude supply fan operation.

A review of the previous use of the surveillance procedure by plant personnel disclosed that supply fans had not been_ running when the test was being performed. This was due to the literal interpretation of Surveillance Requirement (SR) 4.9.12.d.2 and the f act that Technical Specification (T/S) 3.9.12 does not address a requirement for supply fan operation. The requirement to specify exhaust fan lineup in the SR and STP was a

-finding of non-compliance in NRC Combined Inspection Report 50-317/77-16 and 50-318/77-14. After revision of the STP and submittal of a T/S revision request, the finding was closed. (Ref.: . Combined Inspection Report 50-317/77-21 and 50-318/77-20) Supply

. f an operation was not addressed as a Limiting Condition' for Operation in that finding, a fact which furthered the literal interpretation of SR 4.9.12.d.2.

To prevent degradation of negative pressure in the SFP area while handling fuel, frradiated Fuel Handling Procedures will be revised to include a prerequisite that area e . supply fans will not be run while handling fuel. In addition, STP-M-542-0 will be revised

to specifically address supply fan lineup during exhaust fan testing.

. An engineering review of SFP area ventilation system design requirements has been initiated.

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