ML18110A882

LER 1977-335-25 for St. Lucie, Unit 1 Setpoint of Bistable Trip Unit for Steam Generator Pressure Found Inadequately Conservative

ML18110A882
Person / Time
Site:	Saint Lucie
Issue date:	06/03/1977
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
LER 1977-335-25
Download: ML18110A882 (7)

Text

NRC FORM 195 U.S. NUCLEAR REGULATORV Co,osSSION DOCKET NUMBER I2.76)

'3 3 FILE NUMBER NRC DISTRIBUTION FoR PART 60 DOCKET MATERIAL INCIDENT REPORT TO: FROM DATE OF DOCUMENT hIr. Norman C. hIoseley FPL 6-3-77 hIiamI9, Fla. 33101 DATE RECEIVED A.D. Schmidt 6-24-77 gEP,TTER QNOTORIZED PROP INPUT FORM NUMBER OF COPIES RECEIVED

@ORIGINAL QCOPV NCLASSIFIED sic,~~

DESCRIPTION ENCLOSURE Ltr trans the following: 1P Lic. Event Report 77-25 occurring on 5-5-77 involving setpoint oF the bistable tri unit Failing .... (2P)

(1 cy encl rec'd)

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St. Lucie Unit t@0yq C)I lR3MGM PLANT NAME: 1 NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J COLLINS DHL 6-24-77 FOR ACTION/INFORMATION BRANCH CHIEF:

W 3 CYS FOR ACTION LICi ASST,:

W CYS AORS CYS IQRM86 S INTERNAL D ISTR I BUTION ILE NRC D I&E(2 MIPC SCHROEDER/IPPOLITO HOUSTON NOVAK/CHECK GRIMES BUTLER HANAUER TEDESCO/hIACCARY EISENHUT BAER SHAO VOLLMER/BUNCH KREGER/J COLLINS EXTERNAL DISTRIBUTION CONTROL NUMBER LPDR:

TIC:

N 771750i45 )Q Q 8

NRC FORM 196 I2.76)

O. BOX 013100, MIAMI, FL 33101

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FLORIDA POWER & LIGHT COMPANY June 3, 1977 PRN-LI-77-171 Mr. Norman C. Moseley, Director, Region II 6 Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 230 Peachtree Street, N.W., Suite'217 Atlanta, Georgia 30303

Dear Mr. Moseley:

C p

REPORTABLE OCCURRRENCE 335-77-25 ST. LUCIE UNIT. 1 DATE OF OCCURRENCE: MAY 5, 1977 SETPOINT DRIFT The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9 to provide 30 day notification of the subject occurrence.

Very truly yours, A. D. Schmidt Vice President Power Resources MAS:mf Attachment cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control ,(3).

VJ t5 vG i

1 7gpg PEOPLE... SERVING PEOPLE

88 Zl Nd R Nfll'.L6'I

.<,iHA BHISS330Ud J.t<31 NQDQ 03AI3338

<<p l.lCENSEE EVENT REPORT

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89 F L S CONTROL BLOCK:

~

UCONSEE NAME L

~

S 1 1

0 0 0 UCENSE NUMBER 0 0 0 0 0 0 fPL 4 1 GB LICENSE TYPE 1 1 PRINT ALL REQUIRED Ii'JFGR<<JIATIGil7 1: ~03 EVE<<NT TYPE

~

7 14 15 25 26 30 31 32 RcPORT REPORT CATEGORY TYPE SOURCE OOCKET NUMBER ~ EVENT OATE ~ REPORT OATS

[001IcoNT ~L ~L 0 0 0 3 3 5 0 5 0)5 7 7 0 6)0 3 7 7 7 8 57 8 59 60 61 68 69 74 75 80 I

EVENT 'OESCRIPTION tOOj During surveillance testing of the Engineered Safeguards Panel (ESP), the setpoint of 7 8 9 60 the bistable trip unit for Steam Generator Pressure (308) was found to be less conservative 7 89 60 than required by Technical Specification 3.3.2.1. The setpoint. had changed to approximately 7 8 9 '0 Jog 11.89 ma allcwable lower limit of 12.00 ma) . Redundant channels (3) were available.

7 8 9 80 7

~016 8 9 The set int was ad'usted to be at least.04ma conservative with res t to the Technical I 80 PRME, SYSTEM CAUSO CCMPONENT COMPONENT SU~ER

~ol7 ~KB COOS COOE

~A I COMPONENT COOS N S I T E U MANUFACTURER C' 6 0 VCULTCN 7 8 9 10 11 12 17 48 CAUSE OESCRIPTIQN The su 1 to this bistable was re laced durin routine maintenance. Pollowin 7 8 9. 60

~~o(=-) 'eplacement, the setpoint was not checked due to an error in the way retest requirenents 80

~~i t as called for b rocedure) w~e indicated on the lant work order (H~U) .

7 69 FAClUTY METHOO OF 80 STATUS .C POWER' OTHER STATUS OISCOVERY OISCOVERY OESCRIPTION 7 9 '

~oe o NA "

44 10 12 13 45 46 FORM OF ACTIVITY CONTENT 7 8 9,'0 REUASEO g

PERSONNEL EXPOSURES OF RELEASE

~z 11 AMOUNT OF ACTIVITY NA LOCA<<<<ON OF RELEASE NA 60 7 8 9 11 12 13 FERSQNNEL INJURiES NUMBER OESCR<<PTION

~<< ~oo o 7 89 11 12 80'RQBOLQLE CONSEQUENCES 89 60 LOSS OR OAMAGE TQ FACIUTY TYPE OESCR:PTLON z

7 89 10 60 PUBLICITY 7 8 9 ~ 80 AOOITIONAL FACTCPS

~18 I See pane two for cont'~~tion of Event and Cause descriptions.

7 8 9 60 7 89 NAME; -"4- A. SchoQ~ <4'HONE 305 552-3802 CPO ddl <<ddT

REPORTABLE OCCURRENCE 335-77-25 LICENSEE EVENT REPORT PAGE TPlO EVENT DESCRIPTION (continued)

Specification limit." Although this was the second occurrence of this type associated with the ESP, the two occurrences are

.not considered generic. The first occurrence was reported as LER 335-76-17.

(335-77-25)

CAUSE DESCRIPTION (continued)

In addition to adjusting the setpoint, corrective action was taken.to reinstruct personnel on the requirements for retesting equipment after maintenance and to emphasize the importance of following these requirements.

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