05000325/LER-1983-063, Updated LER 83-063/03L-1:on 831203,reactor Water Cleanup Sys (Rwcs) Differential Flow Indicator 1-G31-R615 Showed Erroneous Indication.On 831207,spurious Rwcs Alarm Annunciated.Caused by Air in Sensing lines.W/840222 Ltr

Updated LER 83-063/03L-1:on 831203,reactor Water Cleanup Sys (Rwcs) Differential Flow Indicator 1-G31-R615 Showed Erroneous Indication.On 831207,spurious Rwcs Alarm Annunciated.Caused by Air in Sensing lines.W/840222 Ltr

ML20086R797
Person / Time
Site:	Brunswick
Issue date:	02/22/1984
From:	Dietz C, Pastva M CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
BSEP-84-0443, BSEP-84-443, LER-83-063-03L, LER-83-63-3L, NUDOCS 8403010202
Download: ML20086R797 (3)

LER-2083-063, Updated LER 83-063/03L-1:on 831203,reactor Water Cleanup Sys (Rwcs) Differential Flow Indicator 1-G31-R615 Showed Erroneous Indication.On 831207,spurious Rwcs Alarm Annunciated.Caused by Air in Sensing lines.W/840222 Ltr

Event date:
Report date:
3252083063R00 - NRC Website

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ERC FORM 356 U.S. NUCLEAR REGULATORY COMMISSION

'(7 77)

• LICENSEE EVENT REPORT Update Report:

' Previous' Report Date: 12-30-83 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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R l N8 9l C l LICENSEE B-l E CODE l P l l-l@l0 14 15 l 0l -l O i 0LICENSE l 0l 0NUMt3ERl 0 l - l 0 l 0 l@l 25 426 l 1 LICENSE l 1 l 1TYPE l 1J0l@l57 CAT l 58 l@

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7- 8 60 61 DOCKET NUMBER 68 EVENT DAT2 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h o 2 [Rourine surveillance during unit power operation revealed RWCS dif ferential flow l

[T']T) l' indicator, 1-G31-R615, was showing an erroneous indication of RWCS differential flow. l g'l During subsequent unit power operatian on December 7, 1983, spurious RWCS " Leak Hi-Hi" l Neither event affected the health and safety of the l o 5 l alarm annunciations occured.

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44 47 CAUSE DESC'RIPTION AND CORRECTIVE ACTIONS h g lThe events occured due to entrapped air in the sensing lines of the RWCS leak -detection i i i l system. This resulted from s procedural inadequacy in the RWCS high flow resnonse timel

, 2 l test,'PT-45.2.16, which wr.s performed respectively on December 3 and 6, 1983. The en- [

, 3 l trapped air was removed and the' RWCS Icak detection system was returned to service. [

future similiar g l Appropriate revisions to PT-45.2.16 were implemented to help prevent 80 l

' 7- 8 9 ygegrences. OTHER ST,.TUS DISCOVERf CESCRIPTION STATUS  % POWER OtStoVERY 1 5 W h lIl0l0l@l NA l lAl@l Operator Surveillance l ACTIVITY CO TENT RELEASE AMOUNT OF ACTIVt TY LOCATION OF RELE ASE I

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Brunswick Steam Electric Plant P. O. Box 10429 Southport, NC 28461-0429 February 22, 1984 FILE: B09-13510C SERIAL: BSEP/84-0443 Mr. James P. O'Reilly, Administrator U. S. Nuclear Regulatory Commission Region II, Suite 3100 101 Marietta Street N.W.

Atlanta, GA 30303 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 1 DiCKET NO. 50-325 L! CENSE NO. DPR-71 SUPPLEMENT TO LICENSEE EVENT REPORT 1-83-63

Dear Mr. 0'Reilly:

In accordance with Section 6.9.1.9b of the Technical Specifications for Brunswick Steau Electric Plant, Unit No. 1, the enclosed 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 both are in accordance with the format set forth in NUREG-0161, July 1977.

Very truly yours, b;q C. R. Dietz, General Manager Brunswick Steam Electric Plant MJP/mcg/LETCG2 Enclosure cc: Mr. R. C. DeYoung NRC Document Control Desk OFFICIAL COPY ThL 7-I

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LER-ATTACHMENT - RO #1-83-63 Facility: xBSEP Unit No. 1 Event Date: December 3, 1983 fRoutine Control Room backpasel checks during unit power operation revealed Ethat Reactor Water Cleanup system (RWCS) differential flow indicator 1-C31-R615 wasishowing an indicstion of 40 gpm. A comparative check of RWCS inlet and outlet flows determined that the indication was erroneous. On

' December 7,1983, a spurious, RWCS " Leak Hi-Hi" alarm annunciation occurred.

~

Noither of these events affected the health and safety of the public.

These events resulted from entrapped air in the RWCS leak detection instrumentation. Air was introduced into the instrument sensing lines of the

-affected RWCS instruments, 1-G31-FT-N012, NO36,-and N041, during respective performances of the RWCS'high flow response time test,-Pf-45.2.16, on December 3 and 6, 1983. This resulted from a deficiency in the FT procedure where sensingzline drains to FT-N012 and NO36 are opened in accordance with the procedure.

FT-N012, NO36,-and N041,.one on the RWCS suction line and one each on the two RWCS discharge. lines,Lfeed an RWCS~ summing circuit, 2-G31-FY-K604. K604 takes

.the RWCS' auction' flow and compares it with'the combined RWCS discharge flow to producefa differential flow signal-to the RWCS isolation circuits. 2-G31-R615

=is a. direct reading' indicator off one of the two parallel input signals from 1FY-K604.

In each case, the : entrapped air was removed from the affected RWCC instruments and RWCS leak detection system was returned to service.

TAs'a' result of these events, appropriate revisions to PT 45.2.16'were made and-implemented-in order'to help prevent future similar occurrences.

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