ML18102A745

LER 96-038-00:on 961210,determined Potential Existed for Single Failure of Electrical Penetration Exhaust Fans.Caused by Improper Evaluation of Fan During Initial Plant Design. Completed 10CFR50.73 evaluation.W/970109 Ltr

ML18102A745
Person / Time
Site:	Salem
Issue date:	01/09/1997
From:	Garchow D, Hassler D Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-96-038, LER-96-38, LR-N97028, NUDOCS 9701130143
Download: ML18102A745 (4)

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• 0 PS~G Public Service Electric and Gas Company P.O. Box 236 Hancocks Bridge, New Jersey 08038-0236 Nuclear Business Unit J ~\!~ 0 9 1997 LR-N97028 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 LER 272/96-038-00 SALEM GENERATING STATION - UNIT 1 FACILITY OPERATING LICENSE NO. DPR-70 DOCKET NO. 50-272 Gentlemen:

This Licensee Event Report entitled "Failure of One of Two Switchgear Penetration Exhaust Fans Places Plant In An Unanalyzed Condition" is being submitted pursuant to the requirements of the Code of Federal Regulations 10CFR50. 73 (a) (2) (i) (B).

Attachment DVH c Distribution LER File 3.7

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9701130143 970109 PDR ADOCK 05000272 S PDR The pm\*er is in your hands.

95-2168 REV. 6/94

(4-95)

NRC FORM 366

• U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT (LER)

APPROVED BY OMB NO. 3150-0104 EXPIRES 04#30198 ESTIMATED BURDEN PER RESPONSE TO COMPLY WITH THIS MANDATORY INFORMATION COLLECTION REQUEST: llO.O HRS.

REPORTED LESSONS LEARNED ARE INCORPORATED INTO THE LICENSING PROCESS AND FED BACK TO INDUSTRY. FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO THE INFORMATION AND RECORDS MANAGEMENT BRANCH (T~ ~~NUCLEAR (See reverse for required number of REGULATORY COMMISSI~ WASHINGTON, DC , AND TO THE PAPERWORK REDU ION PROJECT &:150-0104), OFFICE OF digits/characters for each block) MANAGEMENT AND BUDGET, WASHINGTON, 20603.

FACIU 1 T NAllE (1) DOCKET NUllBER (2) PAGE(S)

SALEM GENERATING STATION UNIT 1 05000272 1 OF 3 TITLE (4)

FAILURE OF ONE OF THE TWO SWITCHGEAR PENETRATION EXHAUST FANS PLACES PLANT IN AN UNANALYZED CONDITION EVENT DATE (5) LER NUMBER (6) REPORT DATE (7) OTHER FACILITIES INVOLVED (8)

MONTH DAY YEAR YEAR I SEQUENTIAL NUMBER IREVISION NUMBER llONTH DAY YEAR FACILITY NAllE SALEM UNIT2 DOCKET NUllBER 05000311 12 10 96 96 - 038 - 00 01 09 97 FACILITY NAME DOCKET NUMBER 05000 OPERATING THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check one or more) (11)

MODE(9) N 20.2201(b) 20.2203(a)(2)(v) 50. 73(a)(2)(i) 50. 73(a)(2)(viii)

POWER 20.2203(a)(1) 20.2203(a)(3)(i) x 50.73(a)(2)(ii) 50. 73(a)(2)(x)

LEVEL(10) 000 20.2203(a)(2)(i) 20.2203(a)(3)(ii) 50. 73(a)(2)(iii) 73.71 20.2203(a)(2)(ii) 20.2203(a)(4) 50. 73(a)(2)(iv) OTHER 20.2203(a)(2)(iii) 50.36(c)(1) 50. 73(a)(2)(v) ~~In Abelnlct below or In C Form 386A 20.2203(a)(2)(iv) 50.36(c)(2) 50. 73(a)(2)(vii)

LICENSEE CONTACT FOR THIS LER (12)

NAME TELEPHONE NUMBER (Include Area Code)

Dennis v. Hassler, LER Coordinator 609-339-1989 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

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REPORTABLE *::::::::::::::::::::::::::::

CAUSE SYSTEM COMPONENT MANUFACTURER CAUSE SYSTEM COMPONENT MANUFACTURER REPORTABLE TONPRDS TONPRDS

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SUPPLEMENTAL REPORT EXPECTED (14) EXPECTED MONTH DAY YEAR SUBMISSION IYES (If yes, complete EXPECTED SUBMISSION DATE). xlNO DATE(15)

ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines) (16)

During a design review of the Switchgear Area Ventilation (SPAV) perfonnance, Engineering detennined that the potential existed for a single failure of the Electrical Penetration Exhaust Fans to place the unit in an unanalyzed condition. The two Electrical Penetration Exhaust Fans each provide 50 percent of the exhaust flow from the penetration areas. In summer months, the failure of one fan could result in higher than analyzed terrperatures in the Electrical Penetration area, which contains the motor control centers for the three trains of safety-related, motor-operated valves and other Technical Specification required instrumentation.

The cause of this occurrence is that the effect of only one Electrical Penetration Exhaust Fan operating was not properly evaluated during the initial plant design. The corrective actions are to corrplete a 10CFR50.59 Evaluation, update the UFSAR, and establish administrative controls addressing removal of an exhaust fan from operation.

This condition is reportable in accordance with 10 CFR 50.73(a) (2) (ii) (A)' any event or condition that resulted in the nuclear power plant being in an unanalyzed condition.

NRC FORM 366 (4-95)

NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION

• (4-95)

LICENSEE EVENT REPORT (LER)

TEXT CONTINUATION FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER 6) PAGE(3) 05000272 YEAR I SEQUENTIAL NUMBER REVISION NUMBER 2 OF 3 SALEM GENERATING STATION UNIT 1 96 - 038 - 00 TEXT (If more space i1 required, use additional copies of NRC Form 366A) (17)

PLANT AND SYSTEM IDENTIFICATION Westinghouse - Pressurized Water Reactor Switchgear Ventilation System {VF/-}*

• Energy Industry Identification System (EIIS) codes and component function identifier codes appear as (SS/CCC)

CONDITIONS PRIOR TO OCCURRENCE At the time of identification, Salem Units 1 and 2 were shutdown and defueled.

DESCRIPTION OF OCCURRENCE During a design review of the Switchgear Penetration Area Ventilation (SPAV)

{VF/-} performance, Engineering determined that the potential existed for a single failure of the Electrical Penetration Exhaust Fans {VF/FAN} to place the unit in an unanalyzed condition. The two Electrical Penetration Exhaust Fans each provide 50 percent of the exhaust flow from the penetration areas. The failure of one fan could result in higher than analyzed temperatures in the Electrical Penetration area, which contains the motor control centers for the three trains of safety-related, motor-operated valves and other Technical Specification required instrumentation.

The switchgear Ventilation System is designed to maintain year-round temperatures between 65 and 105 degrees Fahrenheit within the areas served.

With only one Electrical Penetration Exhaust Fan operable, the temperature could exceed 105 degrees.

Engineering has performed a preliminary analysis that indicates that with only one exhaust fan operating, room temperatures will not exceed 110 degrees. An additional preliminary engineering analysis indicates that temperatures above 105 degreees but not exceeding 110 degrees will not affect operability of equipment in the affected areas.

CAUSE OF OCCURRENCE The cause of this occurrence is that the effect of only one Electrical.

Penetration Exhaust Fan operating was not properly evaluated during the initial plant design.

NRC FORM 366A (4-95)

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NRC FORM 366A (4-95)

LICENSEE EVENT REPORT (LER)

• U.S. NUCLEAR REGULATORY COMMISSION TEXT CONTINUATION FACILITY NAME (1)

SALEM GENERATING STATION UNIT 1 DOCKET NUMBER (2) 05000272 LER NUMBER (6)

YEAR I SE.fil'.f:J~AL I== 3 PAGE(3)

OF 3 96 - 038 - 00 TEXT (If more space is required, use additional copies of NRC Form 366A) (17)

PRIOR SIMILAR OCCURRENCES LER 272/95-008-00 reported a similar concern of exceeding 105 degrees if only one of the three Electrical Penetration Supply Fans were operable. This occurrence was caused by the failure of two of the supply fans. LER corrective actions addressed the supply fans and did not address the exhaust fans.

In the past two years there were eleven LERs that addressed design as the cause.

These LERs are 272/95-014-00, 272/95-020-00. 272/95-029-00, 272/96-001-00, 272/96-010-00, 272/96-012-00, 272/96-018-00, 272/96-019-00, 272/96-020-00, 272/96-034-00 and 272/96-037-00. Corrective actions for these LERs were specific to the particular issue.

SAFETY CONSEQUENCES AND IMPLICATIONS Based on the preliminary engineering analysis performed, this condition resulted in no consequences. The maximum room temperature has been preliminary determined to not exceed 110 degrees with one exhaust fan operating. It is unlikely that any equipment failures would have occurred if the room temperatures did not exceed 110 degrees.

The health and safety of the public was not affected.

CORRECTIVE ACTIONS

1. A 10CFRS0.59 Evaluation addressing operation with only one exhaust fan operating and resulting UFSAR update will be completed prior to Salem Unit 2 entering Mode 4.

2. Administrative controls to address removal from service of an Electrical Penetration Exhaust Fan will be implemented prior to Salem Unit 2 entering Mode 4.

NRC FORM 366A (4-95)