05000317/LER-1981-043-03, /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

/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: 05000317/LER-1981-043, Forwards LER 81-043/03L-0 05000317/LER-1981-043-03, /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
References
LER-81-043-03L, LER-81-43-3L, NUDOCS 8107240294
Download: ML20009D726 (2)

LER-1981-043, /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

Event date:
Report date:
3171981043R03 - NRC Website

text

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

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 l At 0900 with Units 1 and 2 at full oower while conducting a routine i

i o 13 l l test, it was discovered that the Soent Fuel Pool (SFP) exhaust fans did l

1 o 141 l not maintain the required negative pressure in the SFP area (T.S. 3.9.

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1. 11 SFP supply fan was tagged off so that the required negative l

lo is l l pressure could be maintained. No fuel handling was in progress during l

lo lil I the event. No similar occurrences have been repUrted.

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fan control switches have been tagged to orevent fan use. Fuel Handling 1

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fuel. A system design /T.S. review action has been initiated.

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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

. supply fans will not be run while handling fuel. In addition, STP-M-542-0 will be revised e

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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