05000366/LER-1982-068, Updated LER 82-068/03X-1:on 820707 & 24,volumetric Weighted Average Drywell Air Temp Exceeded Tech Spec Limit of 135 F. Caused by High Ambient Temp & Failure of Alternate Chiller Fans 8B & 9B.New Chilling Units Installed

Updated LER 82-068/03X-1:on 820707 & 24,volumetric Weighted Average Drywell Air Temp Exceeded Tech Spec Limit of 135 F. Caused by High Ambient Temp & Failure of Alternate Chiller Fans 8B & 9B.New Chilling Units Installed

ML20078J664
Person / Time
Site:	Hatch
Issue date:	10/26/1983
From:	Nix H, Tipps S GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
GM-83-970, LER-82-068-03X, LER-82-68-3X, NUDOCS 8310170584
Download: ML20078J664 (4)

LER-2082-068, Updated LER 82-068/03X-1:on 820707 & 24,volumetric Weighted Average Drywell Air Temp Exceeded Tech Spec Limit of 135 F. Caused by High Ambient Temp & Failure of Alternate Chiller Fans 8B & 9B.New Chilling Units Installed

Event date:
Report date:
3662082068R00 - NRC Website

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NRC FORM 366 U. S. NUCLEAR REGULATSRY COMMISSION

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LICENSEE EVENT REPORT UPDATE REPORT PREVIOUS REPORT DATE 8-3-82 CONTROL BLOCK: l 1

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74 76 7 8 60 61 DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012 l l On July 7 and again on July 24. 1982 the vninmatric walehtoa averne. l 10 I a l l drywell air temp (calculated as per the Survelliance -ecks Procedure) l l o 14 l l exceeded the 135* limit of Tech. Specs. sect 10n 3.6.1.7. The "Bi" and l lo Is] ] "9A" drywell chiller-fan units and both chillers were operable throurh- l 0 6 l out both events. An 8-hour 1,C0 was initiated for each event. The henith l l0 l7l l and safety of the public were not affected by this non-repetitive event. I l o is i i I DE CODE SUBC E COMPONENT CODE SUSCOdE S E l0l9l lS lB l h d h lX lh l H l T l E l X l C l H Ih [Ljh [2_j h 10 7 8 9 11 12 13 18 19 20

._ SEQUENTIAL OCCURRENCE REPORT REVISION LER EVENT YE AR R EPORT NO. CODE TYPE N O.

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33 34 35 36 37 40 41 42 83 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li l o i l The cause of the July 7 event was determined to be a combination of high I i i l emblent temp and the failure of alternate chiller fan units "8B" and 1 i 7 l "9B" to provide adequate cooling. Engineering testing on July 24 resulted I i 3 l in the chiller compressor tripping. A design change reauest (DCR 81-008) l i 4 l has been written to install 2 new chilling units in the drywell. I 7 8 9 80 ST S  % POWER OTHER STATUS dis O Y DISCOVERY DESCRIPTION I1 15 I (E_jh l 1 l 0 l 0 l@l NA l h!Operntnc chnarvatInn  !

A TlVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE i e Ni l i ua 7 8 9 tz I @ Ltl 10

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PERSONNEL EXPOSURES NUMBE R TYPE DESCRIPTION L'_LJ 101010 l@l2 l@l NA l PERSONNE L INJU IES NUMBER DESCRIPTION 7

1 a 8 9 l0lolol@l 11 12 NA 80 LOSS TYPE OF OR DAMAGE TO FACILITY Q DESCRIPTION v 1 9 [2._j@l NA l 7 8 9 10 80

• PUB L ICITY Q 8310170584 831006 NRC USE ONLY

• ISSUED DESCRIPTION Vr/ PDR ADOCK 05000366 L2_1.o_1 LN_ j81 Ni s enR I i i Iiiiiiiiiii.

7 8 9 to 68 69 80 1; NAME OF PREPARER PHONE: (912)367-7851

NARRATIVE REPORT FOR LER 50-366/1983-068, Rev. 1 UPDATE REPORT-PREVIOUS REPORT DATE 8/3/82 LICENSEE  : GEORGIA POWER COMPANY FACILITY NAME  : EDWIN I. HATCH DOCKET NUMBER  : 50-366 Tech. Specs, section(s) which requires report:

This 30-day LER is required by Tech. Specs, section 6.9.1.9.b because it showed that the unit was not meeting the requirements of Tech. Specs. section 3.6.1.7.

Plant conditions at the time of tha event (s)

On July 7, 1982, the plant was in a steady state of operation at 2424.75 MWt (approximately 100% power).

On July 24, 1982, the plant was in a steady state of operation at 162 MWt (approximately 7% power).

Detailed description of the event (s).

On July 7, 1982, during performance of the " SURVEILLANCE CHECKS" procedure (HNP-2-1050), it was discovered that the drywell air temperature was 134.46*F. The Tech. Specs. section 3.6.1.7 limit is 135 F. In an attempt to lower this temperature, chiller fan units "8A" and "9A" were removed from service and alternate chiller fan units "8A" and "98" were placed in operation. Approximately 45 minutes later, the volumetric weighted average drywell temperature (calculated by the control room operator as per HNP-1050) increased to 139 F which exceeded the limit of Tech. Specs. section 3.6.1.7.

On July 24, 1982, a site engineer supervised an attempt to test

operate the "B" chiller fan units. During the test, the drywell l chiller tripped, and the drywell air temperature reached 143 F which exceeded the limit of Tech. Specs. section 3.6.1.7.

l Consequences of the event (s):

These events had no effect upon plant operations. The health and safety of the public were not affected by these events.

Status of redundant or backup subsystems and/or systems:

The "8A" and "9A" chiller fan units were operable during these events.

Justification for continued operation:

An 8-hour LCO was initiated as per Tech. Specs, section 3.6.1.7, ACTION for both of these events.

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' Narrative Report for LER 50-366/1983-068, Rev. 1 Page Two If repetitive, number of previous LER:

These events are non-repetitive.

Impact to other systems and/or Unit:

These 1.

events had no impact upon any other Unit 2 system or on Unit Cause(s) of the event (s)-

An investigation revealed that the first event was caused by a high ambient temperature and the failure of alternate chiller fan units "8B" and "9B" to provide adequate cooling.

The cause of the second event is unknown.

Immediate Corrective Action:

Chiller fan units "8A" and "9A" were returned to service and the volumetric weighted average drywell temperature was below 135 F within 30 minutes. The LCO was cleared.

The "B" chiller was returned to service and the drywell temperature was below 135 F within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. The LCO was cleared.

Supplemental Corrective Action:

No supplemental corrective action was required for either of these events.

Scheduled (future) corrective action:

Design change request (DCR 81-008) has been written to add 2 new chilling units to the drywell.

Action to prevent recurrence (if different from corrective actions)

N/A

e

,, Georgi 3 Power Company

, , Post Offic2 Box 439

- Baxliy, Georgia 31513 Telephone 912 367-7781 912 537-9444 U BC1Gyo iaPbwer Edwin I. Hatch Nuclear Plant

/'S t October 6, 1983 GM-83-970 PLANT E. I. HATCH Licensee Event Report Docket No. 50-366 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region II Suite 3100 101 Marietta Street Atlanta, Georgia 30303 ATTENTION: Mr. James P. O'Reilly Attached is Licensee Event Report No. 50-366/1982-068, Rev. 1.

This report is required by Hatch Unit 2 Technical Specifications Section 6.9.1.9.b.

b H. C. Nix General Manager HCN/SBT/djs xc: R. J. Kelly G. F. Head J. T. Beckham, Jr.

P. D. Rice K. M. Gillespie S. B. Tipps R. D. Baker Control Room Document Control Ggq1c1 A1, CMY g A At 1

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