05000259/LER-1982-064, Updated LER 82-064/03X-1:on 820823 & Jan 1984,Station II Cable Tray Fixed Spray Sys Did Not Meet Tech Spec Requirements.Caused by Restriction in Supply Line Strainer Due to Buildup of Silt & Clam Shells

Updated LER 82-064/03X-1:on 820823 & Jan 1984,Station II Cable Tray Fixed Spray Sys Did Not Meet Tech Spec Requirements.Caused by Restriction in Supply Line Strainer Due to Buildup of Silt & Clam Shells

ML20084G095
Person / Time
Site:	Browns Ferry
Issue date:	04/20/1984
From:	Jones G, Mcpherson B TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-82-064-03X-01, LER-82-64-3X-1, NUDOCS 8405070065
Download: ML20084G095 (3)

LER-1982-064, Updated LER 82-064/03X-1:on 820823 & Jan 1984,Station II Cable Tray Fixed Spray Sys Did Not Meet Tech Spec Requirements.Caused by Restriction in Supply Line Strainer Due to Buildup of Silt & Clam Shells

Event date:
Report date:
2591982064R00 - NRC Website

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UPDATE REPORT PREVIOUS REPORT DATE:

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.e DOCKET NUMBER EVENT DaTE R EPORT D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o l2 } l During normal operation while performing SI li.11. A.1.g (Building Hydraulic l

lo 13 l l Performance Verification), it was determined that unit 1. Station II cable l

l0 l4 l l tray fixed spray system did not_ meet technical specification requirements as l

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.F CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 lil0ll Cause in each case was apparent estriction in supply line strainer (Fisher l

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l t l 2 l l cleaned, flushed and satisfactorily retested. Strainers are routinely

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l i l 3 l l inspected and cleaned, and no problems have been detected.

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t Tennessee Valley Authority Form BF 17 Browns Ferry Nuclear Plant BF 15,2 2/1%d2 LER SUPPLEBIENTAL INFORb1ATION BFRO-50 259 /

82064R1 Technical Specification Involved 3 11.A.9 Reported Under Technical Specification 6.7 2.b(2) 4/21/ 84

• Date Due NRC Event Narrative:

- Unii. 2 was in a refueling outage; unit 3 was operating at 95-percent power.

Units 2 and 3 were unaffected by this event. With unit 1 operating at 96-percent power, during the performance of Surveillance Instruction (SI) 4.11.A.1.g (Building Hydraulic Performance Verification), it was determined the Station II cable tray fixed spray system did not meet Technical Specifi-cation (T.S.) requirements as shown in Table 3 11. A.

There was no effect on public health and safety.

A patrolling fire watch was established in accordance with T.S. 3 11.A.2.

There are no redundant systems.

The strainer (Fisher Governor Co., Fre-Flo 260C) to this station was removed, cle,aned, flushed, and the station retested and found to meet T.S. require-ments. The cause was an apparent restriction in the supply line strainer due to a buildup of silt and clam shells. This station was retested within the following 18-months (T.S. frequency is once/3 years) in order to determine if any further changes in performance had occurred.

When retested (January 27, 1984), the unit 1 Station II cable tray fixed spray system again failed to meet T.S. requirements.

There was no effect on public health and safety.

A fire watch was established and the strainer to this station was again removed, cleaned, and flushed.

The station was retested and was found to meet T.S. limits. The station was out-of-service approximately six hours. The strainers on this system are routinely back-flushed every month and removed, checked, and cleaned once every three months per Mechanical Maintenance Instruction 122 (High Pressure Fire Protection System Flush, Strainer Inspection, and Strainer Cleaning). No specific problems have been detected based on the inspections.

The flow problem identified by surveillance testing appears to affect only Station II.

"In addition to the routine strainer inspections, Station II will have its strainer remqved, checked, and cleaned every month.

At the next scheduled performance of SI 4.11. A.1.g (June 1985), the effect of tripling the preven-tive maintenance frequency will be investigated.

1. Previous Similar Events:

Retention :

'criod - Lifetime; Responsibility - Document Control Supervisor

• ltevision :

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l lB TENNESSEE VALLEY. AUTHORITY Browns Ferry Nuclear Plant P. O. Box 2000 Decatur, Alabama 35602 1

d, D April 20, 1984 J

l Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 i

Dear Mr. O'Reilly:

TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT UNIT 1 - DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50-259/82064 R1 The enclosed report provides followup information concerning unit 1, station II cable tray fixed spray system. This report is submitted in accordance with Browns Ferry Unit 1 Technical Specification 6.7.2.b.(2).

Very truly yours, l

TENNESSEE VALLEY AUTHORITY 6.

G. T. Jones Power Plant Superintendent Browns Ferry Nuclear Plant Enclosure oc (Enclosure):

U. S. Nuclear Regulatory Commission Document Control Desk Washington D.C.

.20555 NRC Inspector, Browns Ferry Nuclear Plant J

ll An Equal Opportunity Employer ggg