ML18152B157

LER 88-011-00:on 880423,control Room/Relay Room Chiller Removed from Svc After Second Chiller Removed from Svc. Caused by Fouled Chiller Refrigerant filter-dryer Elements. Filter-dryer Elements replaced.W/880520 Ltr

ML18152B157
Person / Time
Site:	Surry
Issue date:	05/20/1988
From:	Benson D VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-022, 88-22, LER-88-011-02, LER-88-11-2, NUDOCS 8806010092
Download: ML18152B157 (4)

Text

POW 28-06-01-01 NRC Form 3M U.S. NUCLEAR REGULATORY COMMIS&IOII!19-831 APPROVED 0MB NO. 31LI0-01Ge LICENSEE EVENT REPORT (LER) EXPIRES: 1/31/111 FACILITY NAME 111 DOCKET NUMIIER 121 T PAGE 131 Surry Power Station, Unit 2 TITLE 141

!o 15 I o 1.0 I o I 2 18 11 1 OF O 13 Control/Relay Room Chiller Inoperable Due to Fouled Filter-Dryer Element IVINT DATE 1111 LEA NUMBER 1111 REPORT DATE 171 OTHER FACILITIES INVOLVED Ill MONTH DAY YEAR YEAR .}{ SE~~~~;~AL ( } ~~~~~~ MONTH DAY YEAR FACILITY NAMES DOCKET NUM8ERISI o I 4 2 I 3 a a a la - o I1 I 1 - o I o o Is 21 o a Ia THII REPORT 111 IUIMITTED PURIUANT TO THE REOUIREMENTII OF 10 CFR §: (Ch0<:k on, or moro of 1h1 following) 1111

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ABSTRACT (Limir ro 1400 1P1ce,, i.e.* 1pproximer,/y fif?Hn 1ingl**11>>C* rvpewrirr,n Hnel} (11)

NO SUBMISSION DATE {151 I I I On April 23, 1988 at 2316 hours0.0268 days <br />0.643 hours <br />0.00383 weeks <br />8.81238e-4 months <br />, with Unit 1 in cold shutdown and Unit 2 at 100% power, it was necessary to remove from service one of the three control room/relay room chillers, 1-VS-E-4A (EIIS-CHU), to perform minor maintenance. The refrigerant filter-dryer was becoming clogged and the unit was secured to prevent the unit from tripping. The "B" chiller unit (l-VS-E-4B) had previously been removed from service for a major overhaul, leaving only one chiller (l-VS-E-4C) operating. This is contrary to Technical Specification 3 .14 which requ-ires one control room/relay room chiller to be operating and another to be operable. The refrigerant filter-dryer elements of 1-VS-E-4A were becoming fouled with debris and required replacement. Chiller.l-VS-E-4A had recently been replaced with a new unit. This type of debris is not unusual when a new chiller/unit is placed in service. Chiller 1-VS-E-4A was secured, the filter-dryer elements were replaced, and the chiller was returne*d to service at 2334 hours0.027 days <br />0.648 hours <br />0.00386 weeks <br />8.88087e-4 months <br /> on April 23, 1988. A major upgrade of the chiller units has been completed to improve the capacity and reliability of these units.

8806010092 880520 PDR ADOCK 05000281 S PDR NRC Form 31111 19-831

POW 28-06-01-01 NRC Farm 366A U.S. NUCLEAR REGULATORY COMMISSION (9-831

. LICENSEE EVENT REPORT (LERI TEXT CONTINUATION APPROVED 0MB NO. 3150-0104 EXPIRES: 8/31 /88 FACILITY NAME (11 DOCKET NUMBER (2) LER NUMBER (61 PAGE (31 Surry Power Station, Unit 2 o Is I o I o I o I 2 I 8 I 1 8 I 8 - OI 11 1 - OI O OI 2 OF O I3 TEXT /ff more ,poco i8 required, U/ltJ 11ddition11/ NRC Form 366A'8J (17) 1.0 Description of the Event On April 23, 1988 at 2316 hours0.0268 days <br />0.643 hours <br />0.00383 weeks <br />8.81238e-4 months <br />, with Unit 1 in cold shutdown and Unit 2 at 100% power, it was necessary to remove from service one of.the three control room/relay room chillers, l-VS-E-4A (EIIS-CHU), to perform minor maintenance. The refrigerant filter-dryer was becoming clogged and the unit was secured to prevent the unit from tripping. The "B" chiller unit (l-VS-E-4B) had previously been removed from service for a major overhaul, leaving only one chiller (1-VS-E-4C) operating. This is contrary to Technical Specification 3.14 which requires one control room/relay room chiller to be operating and another to be operable. Maintenance was com-pleted and 1-VS-E-4A was returned to service at 2334 hours0.027 days <br />0.648 hours <br />0.00386 weeks <br />8.88087e-4 months <br /> on April 23, 1988. The chiller was out of service for a period of approxi-mately 18 minutes.

2.0 Safety Consequences and Implications The control room/relay room air conditioning system consists of three 100% capacity air conditioning chiller units. The design temperature of the control and relay room spaces is from 40 degrees Fahrenheit to 100 degrees Fahrenheit, and the electrical equipment has been qualified to 120 degree$ Fahrenheit ambient temperature.

During this event, the control room/relay room air handling units, which receive chilled water from the chiller units, remained operable or operating. In addition, there was no noticeable in-crease in ambient temperature of the affected. areas. Therefore, the health and safety of the public were not affected.

3.0 Cause T.he refrigerant filter-dryer elements of 1-VS-E-4A were be-coming fouled with debris and required replacement. Chiller l-VS-E-4A had recently been replaced with a new unit. This type of debris is not unusual when a new chiller unit is placed in service.

4.0 Immediate Corrective Action(s)

Chiller 1-VS-E-4A was secured, the filter-dryer elements were replaced, and the chiller was returned to service.

NRC FORM 366A (9-831

POW 28-06-01-01 NRC Form 366A U.S. NUCLEAR *REGULATORY COMMISSION (9-83)

• LICENSEE E T REPORT (LER) TEXT CONTINUAT N APPROVED 0MB NO. 3150..:.0104 EXPIRES: 8/31 /88 ll'ACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3)

,:,:,:,:,: SEQUENTIAL *:,:,:,;,;. REVISION YEAR  :;:;:;:;:;: NUMBER  ;:;:;:;:::* NUMBER Surry Power Station; Unit 2 o Is I o I o I o 1 21 s 11 s I s - o 1 11 1 - o Io o 13 oF o p TEXT (ff mom_,,,, is required, u.,, additional NRC Farm 366A'sl (17) 5.0 Additional Corrective Action(s)

A major upgrade of the chiller units has been completed to improve the capacity and reliability of these units.

6.0 Action(s) Taken to Prevent Recurrence Replacement of the filter-dryers is considered normal maintenance.

No additional actions are required at this time.

7.0 Similar Events None.

8.0 Manufacturer/Model Number McQuay, Model KB086 NRC FORM 366A (9-831

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Vl,.Gl'NIA !L(CT .. IC ANO POWER COMl',iNv Surry ,owe, Station

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Surrv, Vlrglnl1 23883 May 20. 1988 U.S. Nuclear Regulatory Commission Serial Hoa: 88-022 Document Control Desk Docket Ro.: 50-281 016 Phillips Building Licensee Moo : DPR-37 Washington, D.C. 20555 Gentlemen:

Pursuant to Surry Power Station Technical Specifications. Virginia Electric and Power Company hereby submits the following Licensee Event Report for Surry Unit 2.

REPORT NUMBER 88-011-00 This report has been reviewed by the Station Nuclear Safety and Operating Committee and will be reviewed by Safety Evaluation and Controlc Very truly yours~

David L. Benson Station Manager Enclosure cc: Dro J. Nelson Grace Regional Administrator Suite 2900 101 Marietta Street, RW Atlanta. Georgia 30323