ML20085M457

From kanterella
Jump to navigation Jump to search
LER 76/003:on 760206,during Weekly Surveillance Test on 1B Standby Generator Set,Output Breaker Would Not Close.Caused by Store Energy Arm Shaft Keeper & Arm Falling Off,Reducing Spring Force to Below Requirements
ML20085M457
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 02/13/1976
From: Franek W, Swart F
PUBLIC SERVICE CO. OF COLORADO
To: Howard E
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20085M459 List:
References
LER-76-003, LER-76-3, P-76042, NUDOCS 8311080585
Download: ML20085M457 (7)
v • d • e


Text

_ _ _ _ _

Q LICENSEE EVENT RE$T -

CONTROL BLOCK ( I l l l l l (PLEASE PRINT ALL REQUIRED INFORMATION) 1 6 NAME LCENSE NOVBER v TYPE 81010 IFISI Vl/14l ICIOl-Idl01010101-16161 7 09 15 141/  ! / lflOI 101/l 25 26 30 31 32 CATEG N T7P E CKET N DER EVENT CATE REPORT CATE 01 CON'T l hl 7 8 57 58

[E 59 l

60 l l l6l l-l l2l42l7l l8 l1lCl 6l l l- lOl2l/l3l7lhl 1

61 68 69 74 75 80 EVENT DESCR!PTION EBl D fA A i M 7 89 p'"

T/1 t0 fAle 9 .h.AV S us O e/L n w e e l 80 BBlTBST 7 89 on 1P R t o v lh V /

4 o o M e n a l".o A 80 i

EE I s e T.

7 89 '

-r'A e o u 7- # u1- ' Anf. a J e A

~

I 80 58 l C n u L D n07 A 'e. e L O G Gd- T b' d d ^ e a A M . l

' ni Y S To A <? d % asay Ei s rb aj ci a n v/ uJ o g Pu1'sd pl a C e 4' Uof$

.7 89 a # ,gy, '

80 l CocE uN R vot4TcN E I!loEl to 7 89 10 11 12 ait I Ic DMPoNEIhCoMCE 17 lej i 43 cioioISI 44 47 L7_1 48

' CAUSE DESCR:PTION ne l STO n ed 7 89 .

P v,e A T V a s .w SAo Cf A e ese r '

80 I

Bi l 6 294 0 7 89 oP7 a nd o .A w Feu o P 7. > td uci n80i

/

& W h Sir. Yan co A C l- %' A ER U!Aed . . p a p asritoni scAw A<stord h*E/enl

% POWER OTHER STATUS C VERY DISCOVERY CESCRPTCN 1

7 8 3$

9

(

10 10l0l d12 lianveru.aveel 13 44 lh]

45 llanctbo 46 Fbaed T o e L o c e .l 80 E EO OF LEASE AMOU LOCATCN OF RELEASE E 17J Lo_I I 'n oNT OF ACTMTV 1 I n et- I 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES l NUMBER TYPE DESCR@TCN I

BE 1010101 LZJ l '4 0 1 7 89 11 12 13 80 '

~

PERSONNEL INJunlES NUMBER DESCRPTCN H l0l0101 I m O_' l 7 89 11 12 80 OFFSITE CONSEQUENCES Xl A CL I 7 89 80 LOSS OR OAMAGE TO FACILITY TYPE DESCAPTON

@ l_2} I10~n R.

7 89 I

80 PUBUCITY n I -A O- l 7 89 80 ADOITIONAL FACTORS DE I 1 o s O O h pop l.

7 89 80 Ml "

l NAuekA$bd b'k'.Am).I4 V PuCNel7/~750sifMSb GPO est.ge7

i l

s

[- P.O. Box 361, Platteville, Colorado 80631

\

L' February 13, 1976 Fort St. Vrain Unit No. 1 P-76042 Mr. E. Morris Howard, Director Nuclear Regulatory Commission

  • 2egion FI Office of Inspection and Enforcement Suite 1000 Arlington, Texas 76012 Ref: Facility Operating License No. DPR-34 Dociet No. 50-267 Ecar Mr. Eovard:

Enclosed please find a copy of Abnormal Occurrence Report No. 50-267/

76/03, Final, submitted per tha requirements of the Teclinical Specifi-cations.

Also, please find enclosed one copy of the Licensee Event Raport for Abnormal Occurrence Report No. 50-267/76/03.

Very truly yours, Frederic E. Swart Superintendent, Nuclear Production Fort St. Vrain Nuclear Generating Station l

FES/dma - gg l ec: Mr. Roger S. Boyd b\

/ \

' b1- ,

\ U.s.

h,- , 0&g

  • k)f' n%l,;ye o 1647 E , _

I UNUSUAL EVENTS AND AENODfAL OCCURRENCE 8tEPORTS LiRIBUTIONS Number of Copies

  • San Francisco Operations Office f

ERDA

  • 1333 Broadway l Oakland, California 94612 i Atta: Mana ;c r - - - - - - - - - - - - - - - - - - - - - - - - - 2
  • California Patent Group - - - - - - - - - - - - - - - - - - - 1*

Division of Reactor Research and Development ERDA Vashington, D.C. 20545 Attn: Director --------------------------1*

Asst. Dir. for Cas Cooled Reactor Projects ---------2*

Asst. Dir. for Engtg. and Technology ------------1*- - - 1*

Asst. Dir. for Reactor Sa f ety - - - - - - - - - - - -

ERDA- S CRPO- SD - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1

  • P. O. Box 81325 San Diego, California 92138 Project Engineer --------------------------1*

ERDA - SCRPO P. O. Box 1446 Canoga Park, California 91304 Address +++ Director -------------------------------1 Litter ERDA - SCRPO To P. O. Box 1446 Canoga Park, California 91304

,--.--.----3e Technical Information Center ERDA P. O. Box 62 Oak Ridge, Tennessee 37830 **

Hr. E. Ibrris Howard, Director --------------------1 (copy of Licensee Event Address =++

Report)

P Letter Region IV, To Office of Inspection & Enforcement Nuclear Regulatory Commission 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 Director of Nuclear Reactor Regulation Attn: Mr. Roger S. Boyd, Director.

ff)b' (copy of Howard's letter, mailogram, and Licensee Event Report)

Division of Project Management U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (Original of Licensee Address +++ Of fice of Information & Program Control - - - - - - - - - - - - - - - - 1 Event Report)

P Letter U. S. Nuclear 2egulatory Com=ission To Washington, D.C. 20555 Address +++ John H. Vaage. Project Phnager - - - - - - - - - - - - - - - - - - - - 10e FPLC Ceneral Atonic Corpany Letter P. O. Box 81608 To San Diego, California 92138 Secretary, NFSC, Belleview --------------- -----1 Vice President, Engineering & Planning, 39th Avenue Engineering - - - - 1 Manager of Production (Chairman, NFSC), Belleview - - - - - - - - - - - 1 '

Director. Quality Assurance - - - - - - - - - - - - - - - - - - - - - - 1 Technical Services Supervisor - - - - - - - - - - - - - - - - - - - - Superintendent, Nuclear Production ------------------1 Superintendent Operations ----------------------1 TraininC Coordinator -------------------------1

. PO RC Commit t e e-----------------------1

1 Technical Services Files Tr ain in g Review - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6 .

  • Indicates a xerox copy of the letter to the Director, ERDA-SCRPO, is sent with the copics'of .tho -

report. J ,

o .

REPORT DATE: Feb rua ry 13. 1976 ABNORMAL OCCURRENCE 76/03 OCCURRENCE DATE: February 6,1976 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT No. 50-267/76/03 Final 1

IDENTIFICATION OF OCCURRENCE:

The output breaker on "B" standby generator failed to close. This is identified as an abnormal occurrence per Section 2.1, paragraph (f) of the Fort St. Vrain Technical Specifications.

CONDITIONS PRIOR TO OCCURRENCE: Steady State Power Routine Shutdown Hot Shutdown Routine Load Change i

X Cold Shutdown Other (specify)

Refueling Shutdown Routine Startup The major plant parameters at the time of the event were as follows:

i Power RTR O MWth

! ELECT 0 Mwe Secondary Coolant Pressure 15 psig Temperature 70- *F

-Flow 75,000 #/hr.

Primary Coolant

  • Pressure 159 psig i

! Temperature 86 *F Core Inlet 86' *F Core Outlet .

Flow 0 #/hr.

4 4

o o

~

.. n .

l ABNORMAL OCCURRENCE 76/03 "

Page 2 of 4 i

. DESCRIPTIO'N OF OCCURRENCE:

The weekly surveillance was being performed on the diesel generators. The operator had manually started the diesels on "B" standby generator and was

., synchronizing the diesels to the incoming voltage. He attempted to close the output breaker but it would not close. The second attempt also failed 4 to close the breake~r. The electrician was called and he determined the breaker was inoperable. ,

APPARENT CAUSE OF OCCURRENCE: Design Unusual Service Cond.

Including Environ.

Manufacturer X Component Failure Installation /Const. Other (specify)

Operator F.

Procedure

, ANALYSIS OF OCCURRENCE:

The breaker was removed from the circuit and troubleshooting indicated the stored energy closing arm had come off of its shaft. These breakers use energy in a displaced spring to close. The keeper had come off the shaft, allowing the arm to slip off the shaft. This reduced the stored energy below the value needed to close the breaker. (See attached figure.) The keeper was bent and

coming off raises a doubt about initial assembly of the breaker. The breaker on LA standby generator has experienced the same service with no-problems.

CORRECTIVE ACTION: -

The stored energy arm was returned to its required position and a new keeper..

i installed. The breaker was then tested satisfactorily and returned to service.

A visual check of keeper will be added to the semi-annual preventive maintenance

~

' inspection procedure, PME-23.

FAILURE DATA /SIMILAR REPORTED OCCURRENCES:

' Abnormal Occurrence 50-267/74/15A reports loose hardware in same breaker.

-PROGRAMMATIC ' IMPACT:

None CODE IMPACT: ' *

, None -

l- 1; i

i t

e > w --

c: .

O o -

ABNORMAL OCCURRENCE 76/03 Page 3 of 4

, Stored Energy Spring O

. 1

- - ,) - O -- -

a u p - -

L_ i /

g Keeper

g. f (Came off shaf t) Relaxed Stored energy arm position (fell off shaf t)

Normal position (required to close the breaker) o 9

w

. ~. . - - -

.- - - . . - ~ --- ..

1 i

i: o o .

I . ABNORMAL OCCURRENCE 76/03 j

Page 4 of 4 I

b/

Submitted b~y: N , , ,

H. N.' Hiy9ard, Jr(

Technicar Services Supervisor Reviewed by: [. jud t GA vb

Duane Lambert

! Supervisor, Plant Electricians Reviewed by: 7-

Frank M. Mathie Superintendent, Maintenance Approved by
>w _, . . m

., Fry Sup/ericE. SwartNuclear erintendent, Production.

4 l

i i

I e

8 1

1

. - . - -=reH y @ e m9-- n ,  % gA -+p-e --sW-4. --ge' y 'Y-"

Retrieved from "https://kanterella.com/w/index.php?title=ML20085M457&oldid=2738388"