ML20072Q812

RO 50-321/1983-004:on 830321,fire Water Storage Tank Level Dropped Below Tech Spec Limits.Caused by Actuation of Fire Protection Sys Deluge Valve & Main Header Rupture,Causing Pump Start.Valve & Header Isolated & Tank Level Restored

ML20072Q812
Person / Time
Site:	Hatch
Issue date:	03/22/1983
From:	Nix H GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8304050331
Download: ML20072Q812 (2)

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l. 01 BAXLEY, GEORGIA 31513 S],kg y ' k'?'] l

, PMS MR. JAMES P. O'REILLY A/p

• UNITED STATES NUCLEAR REGULATORY COMMISSION '.

DIRECTION OF INSPECTION AND ENFORCEMENT d

REGION II.-SUITE 3100

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101 MARIETTA STREET ATLANTA, GEORGIA 30303 I

SUBJECT:

- Hatch ~ Unit 1 Docket No. 50-321, Notification of Special Report 50-321/1983-004 '

DATE: 3/22/83 NOTIFIED: F. Lomax i-j DATE: 3/21/83 i TIME: 1858 DESCRIPTION OF REPORTABLE OCCURRENCE:

i Initial Condition

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l On 3/21/83, at 1810 CST, with both units at steady state i operation: Unit 1 at 2414 MWt and Unit 2 at 1697'MWt.

[ Nature of Occurrence 1

i The fire alarmLand the fire pump running alarm were. received i in the main control room. Plant personnel were immediately-i dispatched to investigate the alarm condition. Plant j personnel found the electric fire pump and both . diesel. fire '

pumps running and. the

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fire water storage . tank's' level:

decreasing. Both fire water storage tank's levels ~ dropped -

below the requirements-of Unit 1 Tech. Specs. section 3;13.2.b j.

and Unit 2 Tech. Specs. section 3.7.6.1.b (below 270,000' gals.

, each tank). Plant personnel found the deluge system for lB j cooling tower tripped and the main header ruptured.

Immediate Corrective Action i The deluge valve - and the . main t header were - isolated and the fire water storage' tanks' levels were restored to meet . the requirements of Unit 1 Tech. Specs. section 3.13.2.b and Unit-2 Tech. Specs. section 3.7.6.1.b within 5. hours and 50 minutes..

Cause .

.The- 1B' cooling tower fire protection- system- ' deluge _ valve

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. actuated -in addition to - a- main header rupture, causing . the i electric fire; pump. and both-diesel fire pumps to start which-  !

-pumped .the- fire water storage tanks' level . : below' the requirements.specified in Unit ~1 Tech. . Specs. section 3.~13.2.b.

and Unit:2 Tech. Specs. sectionE3.7.6.1.b. .

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Supplemental Corrective Action

. 'No suppl'emental corrective action is required.

Status of Redundant or-Backup Systems Remainder of the Fire Protection system is performing as required.

Impact to Other Units The occurrence is applicable to both Unit 1 and Unit 2. Unit 1 requires a 30-day special report and Unit 2 requires a 24-hour notification and 14-day special report.

Justification for Continued Operation Continued operation is justified due to the Fire Protection system, Fire Tank levels and Fire Pumps being returned to normal conditions.

m M H. C. Nix General Manager

4. . HCN/SBT/abb

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