05000263/LER-1979-021-03, /03L-0:on 791119,during IE Bulletin 79-02 Evaluation,Snubber SS-31 Base Plate Expansion Anchor Bolt Safety Factor Found to Be Less than One.Caused by Inadequate Base Plate & Expansion Anchor Bolts

/03L-0:on 791119,during IE Bulletin 79-02 Evaluation,Snubber SS-31 Base Plate Expansion Anchor Bolt Safety Factor Found to Be Less than One.Caused by Inadequate Base Plate & Expansion Anchor Bolts

ML112900955
Person / Time
Site:	Monticello
Issue date:	12/19/1979
From:	Day B Northern States Power Co
To:	NRC/OI/RGN-III/FO
Shared Package
ML112900956	List: 05000263/LER-1979-021, Forwards LER 79-021/03L-0 05000263/LER-1979-021-03, /03L-0:on 791119,during IE Bulletin 79-02 Evaluation,Snubber SS-31 Base Plate Expansion Anchor Bolt Safety Factor Found to Be Less than One.Caused by Inadequate Base Plate & Expansion Anchor Bolts
References
IEB-79-02, IEB-79-2, LER-79-021-03L-01, LER-79-21-3L-1, NUDOCS 7912270580
Download: ML112900955 (4)

LER-1979-021, /03L-0:on 791119,during IE Bulletin 79-02 Evaluation,Snubber SS-31 Base Plate Expansion Anchor Bolt Safety Factor Found to Be Less than One.Caused by Inadequate Base Plate & Expansion Anchor Bolts

Event date:
Report date:
2631979021R03 - NRC Website

text

M=WULfA I UK Y 1l~1NFUN I

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AN J

D I NADI Al CII I

UN DZ

- 1 MAIUOI ACCESSON NBR:791227058 DOC.DATE: 79/12/19 NOT ZED: NO FACIL: 0-263 Monticello uclear Generating Plant, rthern States AUTH.NAME AUTHOR AFFILIATION DAYB.D.

Northern States Power Co.

RECIP.NAME RECIPIENT AFFILIATION Region 3, Chicago, Office of the Director

SUBJECT:

DOCKET #

05000263 LER 79-021/03L-O:on 791119,during normal operation, per IE Bulletin 79-02 evaluationsnubber SS-31 base plate expansion anchor bolt safety factor found to be less than one.Caused by inadequate base plate & expansion anchor bolts.

DISTRIBUTION CODE: A002S COPIES RECEIVED:LTR / ENCL SIZE:

TITLE: Incident Reports NOTES:

RECIPIENT ID CODE/NAME ACTION:

05 BC COPIES LTTR ENCL 4

4 RECIPIENT ID CODE/NAME COPIES LTTR ENCL INTERNAL:

14 TA/EDO 16 EEB 18 PLANT SYS BR 20 AD PLANT SYS 23 ENGR BR 25 PWR SYS BR 27 OPERA LIC BR 29 AUX SYS BR HANAUERS.

STS GROUP LEADR 1

1 1

1 1

1 1

1 1

1 1

1 1

1 1I 1

1 1

1 1

1 1

02 NRC PDR 11 MPA 15 NOVAK/KNIEL 17 AD FOR ENGR 19 I&C SYS BR 22 REAC SAFT BR 24 KREGER 26 AD/SITE ANAL 28 ACDENT ANLYS E JORDAN/IE R IRELAND TMI-H STREET EXTERNAL: 03 LPDR 29 ACRS 1

16 1

16 04 NSIC 2)

TOTAL NUMBER OF COPIES REQUIRED: LTTR 1

3 1

1 1

1 1

1 1

3 1

1 3

1 1

1 1

1 1

1 3

1 1

1 51 ENCL 51

NORTHERN STATES POWER COMPANY MINNEAPOLIS. MINNESOTA 55401 December 19, 1979 Mr J G Keppler Office of Inspection & Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Anchor Bolts for Snubber SS-31 Found Inadequate The Licensee Event Report for this occurrence is reproduced on the back of this letter.

Enclosed are three copies.

This event is reported in compliance with Technical Specification 6.7.B.2.b.

because operation with an inoperable snubber is a degraded mode permitted by Technical Specification 3.6.H.2.

Yours very truly, L 0 Mayer, PE Manager of Nuclear Support Services LOM/DMM/jh cc: L4)-rector, IE, USNRC (30)

Director, MIPC, USNRC (3)

MPCA Attn:

J W Ferman 0Y (Over) 7 91229o 5

NRC FORM 366 (7-77) 7 8

CON'T 7

8 7

8 7

8 10 m

m 14 U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK:

I I

Di (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

MINIMI NIP 11 2 10 10 1-0 0

01010101 0l-010 l (t 111111 1IOL (ED 9

LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 RE""" [Jj l 01 51 01 010 1 2 16 3 (I 11 11 119 17 19 011 1 21 11 9! 71 9 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES IDuring normal operation, evaluation of IE Bulletin 79-02 inspection results Irevealed snubber SS-31 Base Plate Expansion Anchor Bolt Safety Factor Less Than 1.

ISS-31 declared inoperable. Constitutes operation in degraded mode permitted by I

IT.S. 3.6.H.2. No effect on public health or safety. Analysis showed pipe stress I Iwithin code allowable without SS-31 during SSE, Redundant system operable during I I event.

Not a repetitive occurrerne.

II 9

80 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE cl F (D [B@1 L @3 1 Sl U I o

l PRI l

LBJ (5 L Z 9

10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LE R/RO EVENT YEAR REPORT NO.

CODE TYPE NO.

[REPORT SEQ1UENTA 1R12 11 OCREE R

R Ei NUMBER I.B

[---J Lol 2

1

- j LLO 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS 22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER

_I L O I1 oI olol LJ@

LN.

IA ]

B 11301 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS IReanalysis indicated that base plate and expansion anchor bolts associated with I

ISS-31 were inadequate. The support was modifipd to inerrpnq Rafpty factor tn At I

Ileast 2 within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of event identification. A safety factor meeting the long l Iterm requirements of IE Bulletin 79-02 will be assured.

7 89 FACILITY STATUS

%POWER OTHER STATUS Em LJ@ Lo0 1 9 18 NA 7

8 9

10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY C 16 J @5 LI NA 1

7 8

9 10 11 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRI PTION T 1 10 01 0 10 1Z NA 7

8 9

11 12 13 PERSONNEL INJURIES NUMBER

DESCRIPTION

FT1 0101 0 NA 7

8 9

11 12 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

I Ip NA 7

8 9

10 PUBLICITY ISSUED

DESCRIPTION

F201I IN 1ED1 NA 7

8 9

10

/

NAME OF PREPARER B

y 80 METHOD OF DISCOVERY DISCOVERY DESCRIPTION 32 L..l.

Review of inspection results.

45 46 80 INA LOCATION OF RELEASE3 45 80 80 T9122 80 70 5

1 80 NRC USE ONLY 68 69 80 PHONE: 612/295-5151 0.

(D

NRC FORM 366 O

. NUCLEAR REGULATORY COMMISSION (7-7i 7

8 CON'T

]

7 8

rl"I 7

8 10 1

1 12 13 14 LICENSEE EVENT REPORT CONTROLBLOCK:

1 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

MI NI MI NIP 11 o 10 1-1 0 1010 1010-0 0 4 1 111 1 1()

9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 REPORT 0l 5l 01 0010e2 16 1 3 (G)Il 11 11 119 1719 1 11 2 1l 91 71 9 60 61 DOCKET NUMBER 68 69 EVENT DATE 5

RPTDAE 8

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES I During normal operation, evaluation of IE Bulletin 79-02 inspection resifltR Irevealed snubber SS-31 Base Plate Expansion Anchor Bolt Safety Factor Less Than ISS-31 declared inoperable. Constitutes operation in degraded mode permitted by IT.S. 3.6.H.2.

No effect on public health or safety.

Analysis showed pipe stress Iwithin code allowable without SS-31 during SSE.

Redundant system operable during I event.

Not a repetit-ive orrurrence.

9 s0 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

@l LJ L (@ I sIU 1 0 1RI TI 3 B

LLZJ 9

10 11 12' 13 18 -

19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LER/RO EVENT YEAR REPORT NO.

CODE TYPE REPORT 1719 1-1 012 111 NUMBERCj 1

- J L-2 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN

/NATTACHMENT NPRD-4 PRIME COMP, COMPONENT TAKEN ACTION ON PLANT METHOD HOURS A SUBMITTED FORM sUB.

SUPPLIER MANUFACTURER 1F IS-vl. I.J Lz.i@

Lz (

I 1 0 ool l

L.

IINJ@

LJUN^J 33 W

34 37 lol 110 AJ W@

1O 1B11131010 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS ©2 lReanalysis indicated that base-lAte and eXpansion anchor bolts associated with I SS-31 were inadeguate.

The support was, inedifigg ton inrrpe;-e afpt-Y far-n-r 1-0 q I least 2 within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of event identification.

A safety factor meeting the long I term requirements of TE Bul letin 79-02 will be assured, NO.

METHOD OF 7

89 FSATTS

% POWER OTHER STATUS 7

8 9

lo1 12 13 44 ACTIVITY CONTENT RELF-ASED OF RELEASE AMOUNT OF ACTIVITY 788 I

@ L&

NA I

7 8

9 10 11 44 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

1 7 lol 0 I L J NA 7

89 11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION 41 01 01 01 L(0 NA 7

8 9

11 12 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

1 9

Z 1@1 NA 7

8 9

10 PUBLICITY ISSUED

DESCRIPTION

0 IN IRI NA 7

8 9

10 METHOD OF DISCOVERY DISCOVERY DESCRIPTION W O. I Review of inseection results.

45 46 LOCATION OF RE LEASE I NA 45 BO Bo 80 79122 NAME OF PREPARER B D Day 80 70 5I 80 NRC USE ONLY 68 69 80; 0

PHONE:

612/295-5151

- I s0 45