05000324/LER-1982-024, Updated LER 82-024/01T-1:on 820205,determined That Control Bldg Emergency Ventilation Sys Trains Will Not Isolate Upon Receipt of Chlorine Isolation Signal If Control Switch in on Position Due to Design Deficiency

Updated LER 82-024/01T-1:on 820205,determined That Control Bldg Emergency Ventilation Sys Trains Will Not Isolate Upon Receipt of Chlorine Isolation Signal If Control Switch in on Position Due to Design Deficiency

ML20082D590
Person / Time
Site:	Brunswick
Issue date:	11/14/1983
From:	Allen M, Dietz C CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
BSEP-83-3386, LER-82-024-01T, LER-82-24-1T, NUDOCS 8311220477
Download: ML20082D590 (3)

LER-2082-024, Updated LER 82-024/01T-1:on 820205,determined That Control Bldg Emergency Ventilation Sys Trains Will Not Isolate Upon Receipt of Chlorine Isolation Signal If Control Switch in on Position Due to Design Deficiency

Event date:
Report date:
3242082024R00 - NRC Website

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7 8 60 61 DOCKET NUMBER LVENT DATE EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 l While reviewina loFic orints for the Control Buildinn Emergency Ventilation System, it l o l was determined the system trains will not isolate upon the receipt of a chlorine j o 4 l isolation signal if the system control switch is in the "on" position. Due to l o s l problems experienced with the high radiation initiation function for the emergency l s

o6 l Ventilation trains, the Brunswick station had been running a train with the switch in 1 o 7 l the "on" position from January 25, 198 2, to February 4, 1982. This event did not l oe I affect the health 'and safety of the public. -Technical Specification 6.9.1.8i. l 7 89 80 SYSTEM cAUSE CAUSE COMP. VALVE CODE CoOE SU8 CODE COMPONENT CODE SUSCODE SUCCODE 7

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44 47 CAUSE DESC"RIPTION AND CORRECTIVE ACTIONS h i o lDue to a design deficiency when the system is run in the "on" position, the chlorine l' i i icontacts are bypassed in the circuit. Plant Mod 81-032 is being revised to rearrance i

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, 3 l " Preferred", " Standby", or "On" position, the system will isolate. Installation of l 3 4 l Plant Mod 81-032 will restore the system to the original design intent, and is expected l 7 8 Ig,. ouOF "

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LER ATTACHMENT - RO #2-82-024 SUPPLEMENT Facility: BSEP Unit No. 2 Event Date: February 5, 1982 While reviewing logic prints for the Control Building's Emergency Ventilation System, it was determined that the system trains will not isolate upon the receipt of a chlorine isolation signal if the system control switch is in the "on" position, Due to problems experienced with the high radiation initiation function for the emergency ventilation trains, the Brunswick station had been running a train with the switch in the "on" position from January 25, 1982, to February 4, 1982.

Due.to a design deficiency, when the system is run in the "on" position, the chlorine contacts are bypassed in the circuit. There is currently an administrative control in effect on the use of the emergency ventilation control switch while in the "on" position. This control is OP-37, '

Section II.I, which states:

If an emergency air fan is in the 'on' position,'the chlorine alarm may not close the normal and or emergency make-up air dam;trs. If the Control Building chlorine alarm is received, the emergency fan switches should be immediately placed in the standby readiness condition and ensure the normal and emergency make-up air dampers close.

Plant Modification 81-032 is being revised to rearrange the chlorine contacts so that when a chlorine isolation signal is received while in the " preferred,"

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" standby," or "on" position, the system will isolate. Installation of Plant Modification 81-032 will restore the system to the original design intent and eliminate the use of the aforementioned administrative control. The plant modification is' expected to be installed prior to December 31, 1983.

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$3 Nb Brunswick Steam Electric Plant P. O. Box 10429 Southport, NC 28461-0429 November 14, 1983 FILE: B09-13510C SERIAL: BSEP/83-3386 Mr. James P. O'Reilly, Administrator U. S. Nuclear Regulatory Commission Region II, Suite 3100 101 Marietta Street N.W. 1 Atlanta, GA 30303 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-324 LICENSE NO. DPR-62 SUPPLEMENT TO LICENSEE EVENT REPORT 2-82-024

Dear Mr. O'Reilly:

In accordance with Section 6.9.1.9b of the Technical Speci fications for Brunswick Steam Electric Plant, Unit No. 2, the encle. sed supplemental Licensee Event Report is submitted. The original report fulfilled the requirement for a written report within thirty (30) days of a reportable occurrence and is in accordance with the format set forth in NUREG-0161, July 1977.

Very truly yours, C. R. Dietz, General Manager Brunswick Steam Electric Plant RMP/pms/LETPS1 Enclosure cc: Mr. R. C. DeYoung NRC Document Control Desk l

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