ML18153D362

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LER 93-006-00:on 930513,SW Flow Path to Main CR Chillers Declared Inoperable Due to Pipe Leak.Two Inch Backwash Supply Line & Strainer 1-VS-S-1A & Associated Isolation Valves replaced.W/930608 Ltr
ML18153D362
Person / Time
Site: Surry Dominion icon.png
Issue date: 06/08/1993
From: Kansler M
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
93-355, LER-93-006-01, LER-93-6-1, NUDOCS 9306170161
Download: ML18153D362 (5)
v • d • e


Text

10CFR50.73 Virginia Electric and Power Company Sony Power Station P.O.Box:315 Surry, V:rrginia 23883 June 8, 1993 U.S. Nuclear Regulatory Commission Serial No.: 93-355 Document Control Desk SPS:JDK Washington, D. C. 20555 Docket Nos.: 50-280 50-281 License Nos.: DPR-32

Dear Sirs:

DRP-37 Pursuant to Surry Power Station Technical Specifications, Virginia Electric and Power Company hereby submits the following Licensee Event Report applicable to Surry Power Station Units 1 and 2.

HEPQRrNUMBER 50-280/50-281/93-006-00 This report has been reviewed by the Station Nuclear Safety and Operating Committee and will be forwarded to the Management Safety Review Committee for its review.

Very truly yours, M. R. Kansler Station Manager Enclosure cc: Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 M. W. Branch NRC Senior Resident Inspector Surry Power Station 150152 9306170161 930609 PDR ADOCK 05000280 S PDR

NRC FORIII 366 16-891 e U.S. NUCLEAR REGULATORY COMMISSION e APPROVED 0MB NO. 3150-0104 EXPIRES: 4/30/92 ESTIMATED BURDEN PER RESPONSE TO COMPLY WTH THIS INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWARD LICENSEE EVENT REPORT (LER) COMMENTS REGARDING BURDEN ESTIMATE TO THE RECORDS AND REPORTS MANAGEMENT BRANCH (P-530), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555, AND TO THE PAPERWORK REDUCTION PROJECT (3150-01041, OFFICE OF MANAGEMENT AND BUDGET, WASHINGTON, DC 20503.

FACILITY NAME (11 DOCKET NUMBER 121 I PAGE 131 Surry Power Station, Unit 1 I015101010121810 1 loF 014 141 TITLE Service Water Flow Path to Main Control Room Chillers Inoperable Due to Pipe Leak EVENT DATE (5) LER NUMBER (61 REPORT DATE (7) OTHER FACILITIES INVOLVED (BJ MONTH DAY YEAR YEAR {(: SE~~~~~~AL t? ~~i~~~ MONTH DAY YEAR . FACILITY NAMES DOCKET NUMBER(SI Surry Unit 2 o I 5 IQ I o Io 12 I 811 THIS REPORT IS SUBMITTED PURSUANT TO THE RlaOUIREMENTS OF 10 CFR §: (Ch*ck ono or moro of <h* following} (11)

OPERATING MODE (9)

N 20.402(b) 20.406(cl ,_ 60.73(1)(2)(iv) ..__ 73.71(b) 20.406(1)(1 )(ii 20.406(1)(11(11) 20.406(1)(1 lliiil - X 60.381cll11 60.311(cll21

&o.13!1H21rn (B)

-- 60.73(1ll21M 50.73(11(21(viil 60.73(1l12llviiil(Al 73.71(cl OTHER (Spocify in Absrracr b1/ow ind in Text. NRC Form 366A}

I--

20.406(1)(1 )(Iv) 60.73(1)(21(11) 60.73(1)(2)(vliil(BI 20.406(1)(1 )M 60.73(1)(2l(lli) 60.73(1)(211*1 LICENSEE CONTACT FOR THIS LER (121 NAME TELEPHONE NUMBER AREA CODE M. R. Kansler, Station Manager 81 0 I 4 31 5 17 I - I 3 11 I 81 4 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

MANUFAC- MANUFAC*

CAUSE SYSTEM COMPONENT CAUSE SYSTEM COMPONENT TURER TURER R~~o~l:gtE  :!i!iii!i!ii:!iii!iiiiiii!i!i!i!i!i!iii!i!i!i!i!i!i!i I I I I I I I I I I I I I I I I I I I I I liii!iiiii!i!i!i!i!i!i!i!i!i!i!i!i~ii!lii!i!i!i!ii!i I I I I I I I SUPPLEMENTAL REPORT EXPECTED (141 MONTH DAY YEAR EXPECTED

~ YES (If v*s. comp/et* EXPECTED SUBMISSION DATE} hci ABSTRACT /Limir ro 1400 spoc*s, i.*.* *pproximaroly fifta*n 1ingl*-spac* typowrimn line,/ (16)

NO SUBMISSION DATE (15)

I I I On May 13, 1993, at 1418 hours0.0164 days <br />0.394 hours <br />0.00234 weeks <br />5.39549e-4 months <br />, a fire watch reported a Service Water (SW) leak in Mechanical Equipment Room (MER) four. The leak was identified to be from a two inch backwash supply line [EIIS-BI-PSP] to a Self Cleaning Continuous Backwash Strainer [EIIS-BI-STR], (1-VS-S-lA) in one of two SW flow paths to the Main Control Room (MCR) Chillers. Technical Specification (TS) 3.14.C. requires two operable SW flow paths to one operating and one operable MCR Chiller. The line and strainer associated with the leak were declared inoperable.

At the time of this event, TS 3.14.C had no action statement for an inoperable SW flow path, therefore a six hour LCO to Hot Shutdown was entered for Units 1 and 2 at 1418 hours0.0164 days <br />0.394 hours <br />0.00234 weeks <br />5.39549e-4 months <br /> per TS 3.0.1.* An alternate flow path was placed into service and the action statement was exited at 1733 hours0.0201 days <br />0.481 hours <br />0.00287 weeks <br />6.594065e-4 months <br />.

The backwash supply line was repaired following issuance of a change to TS 3.14.C.

The TS change provided a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> LCO allowing one flow path to be out of service for maintenance. At the time of the event the leakage was evaluated to be manageable with regard to design basis requirements. It is therefore concluded that no safety consequences resulted from the event.

NRC Form 366 (6-89)

NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION

' (6-89) , APPROVED 0MB NO. 3150-0104 EXPIRES: 4/30/92 ESTI TED BURDEN PER RESPONSE TO COMPLY WTH THIS LICENSEE EVE'REPORT (LER) INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO THE RECORDS TEXT CONTINUATION AND REPORTS MANAGEMENT BRANCH (P-530), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555, AND TO THE PAPERWORK REDUCTION PROJECT (3150-0104), OFFICE OF MANAGEMENT AND BUDGET, WASHINGTON, DC 20603.

FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3)

Surry Power Station, Unit 1 0 5 0 0 0 2 8 0 9 3 - 0 0 6 - 0 0 0 2 OF O 4 TEXT /ff more""""' i& n,quirwd, uae additiofllll NRC Form 3511A 's) (17)

1.0 DESCRIPTION

OF THE EVENT On May 13, 1993, at 1418 hours0.0164 days <br />0.394 hours <br />0.00234 weeks <br />5.39549e-4 months <br />, Unit 1 was at 100% power and Unit 2 was at 92% power. A fire watch reported a SW leak in Mechanical Equipment Room (MER) four. The leak was identified to be from a two inch backwash supply line to a Self Cleaning Continuous Backwash Strainer (1-VS-S-lA). The strainer is in one of two Service Water (SW) flow paths to the Main Control Room (MCR) Chillers required by Technical Specification (TS) 3.14.C. The SW flow path containing the two inch backwash supply line is ASME Code Class 3. The two inch backwash supply and the 1-VS-S-lA strainer were' declared inoperable.

To MCR Ch111ers 1-SW-S-10 Duplex Strainer 1-VS-S-lB Service Service Water Service Water Supply Water Backwash~--t .._-1.Jli.1---~ Backwash TS 3.14.C requires one operating and one operable SW flow path to one operating and one operable MCR Chiller. At the time of this event, TS 3.14.C had no action statement for an inoperable SW flow path, therefore a six hour LCO to Hot Shutdown was entered for Units 1 and 2 at 1418 hours0.0164 days <br />0.394 hours <br />0.00234 weeks <br />5.39549e-4 months <br /> per TS 3.0.1.

This report is being made pursuant to 10CFR50.73(a)(2)(i)(B) as the station operated in a condition not allowed by the TS.

NRC Form 366A (6-89)

NRC FORM 366A (6-89) '

LICENSEE EVENT REPORT (LERI e U.S. NUCLEAR REGULATORY COMMISSION e APPROVED 0MB NO. 3150-0104 EXPIRES: 4/30/92 ESTIMATED BURDEN PER RESPONSE TO COMPLY WTH THIS INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO THE RECORDS TEXT CONTINUATION AND REPORTS MANAGEMENT BRANCH (P-530). U.S. NUCLEAR REGULATORY COMMISSION. WASHINGTON, DC 20555, AND TO THE PAPERWORK REDUCTION PROJECT (3150-0104), OFFICE OF MANAGEMENT AND BUDGET, WASHINGTON, DC 20503.

FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3)

Surry Power Station, Unit 1 TEXT (ff man, apace i& n,quirtKJ, UM t1dditional NRC Form 356A 'a) 117) 2.0 SIGNIFICANT SAFETY CONSEQUENCES AND IMPLICATIONS The SW System is designed for the removal of heat resulting from the operation of various systems and components. Per TS**a.14.C one operating and one operable SW flow path to one operating and one operable MCR Chiller are required. Adequate SW flow was available to meet demands of the system. No operating parameters were affected on the MCR Chillers or Charging Pump SW pumps. The operating MCR Chillers and Charging Pump SW pumps remained in service.

The water inleakage was manageable, and did not affect operation of supported equipment. It was concluded that no safety consequences resulted from the event.

3.0 CAUSE OF THE EVENT The event was caused by a component failure of the two inch backwash supply line to the 1-VS-S-lA strainer. This two inch pipe was constructed of schedule 80 carbon steel. Flow through this path consists of brackish water. It was determined that the failure was caused by general corrosion of the pipe. The corrosion resulted in thinning of the pipe wall and eventually resulted in the through wall leak.

4.0 IMMEDIATE CORRECTI\7E ACTION

Operator response to the event placed the Duplex Strainer [EIIS-BI-STR], (1-SW-S-10) in service bypassing* the 1-VS-S-lA strainer.

Maintenance installed a temporary patch on the two inch backwash supply line and an oper~tor was assigned to monitor the line. The systems and components being serviced by the affected SW lines were routinely monitored.

5.0 ADDITIONAL CORRECTIVE ACTION{Sl Since the affected piping was an ASME Code Class 3 low energy system, repair strategies were evaluated using'Generic Letters 91-18 "Resolution of Degraded and Non Conforming Conditions" and 90-05 "Guidance for Performing Temporary Non-Code Repair of ASME Code Class 1, 2, and 3 Piping." The strainer and associated backwash line NRC Form 366A (6-89)

'~ NRC FORM 366A (6-891 . * '

LICENSEE EVENT REPORT (LER) e U.S. NUCLEAR REGULATORY COMMISSION e APPROVED 0MB NO. 3150-0104 EXPIRES: 4/30/92 ESTIMATED BURDEN PER RESPONSE TO COMPLY WTH THIS INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO THE RECORDS TEXT CONTINUATION AND REPORTS MANAGEMENT BRANCH (P-5301. U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555, AND TO 1'HE PAPERWORK REDUCTION PROJECT (3150-01041, OFFICE OF MANAGEMENT AND BUDGET, WASHINGTON, DC 20503.

FACILITY NAME (11 DOCKET NUMBER (21 PAGE (31 LER NUMBER (61 Surry Power Station, Unit 1 0 IS IO IO IO I 2 18 I O 9 I 3 - 0 IO I 6 - 0 I O OI 4 OF O14 TEXT (H more fl/JIJt:11 i& required, U"1 additiofllll NRC Form 3515A's) (171 had been declared inoperable and remained out of service until permanent repairs were completed.

6.0 ACTIONS TO PREVENf RECURRENCE The two inch backwash supply line and the 1-VS-S-lA strainer and associated isolation valves were replaced. The backwash supply line was replaced with a flexible line. This was completed after the receipt of a change to TS. TS 3.14.C.1 was issued 5/17/93 and allows one SW flow path to be inoperable for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. This change was submitted September 4, 1992 as a corrective action resulting from LER Sl 009.

TS change 3.14.Cl, issued 5/17/93, provides a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> LCO to permit maintenance activities anticipated on the SW flow paths to the MCR Chillers.

7.0 SIMILAR EVENI'S None 8.0 ADDITIONAL INFORMATION None NRC Form 366A (6-89)

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