05000280/LER-1978-001, Submit Licensee Event Report No. LER-78-001/03L-0 Re Hydraulic Shock Suppressor Found Inverted with Empty Reservoir

Submit Licensee Event Report No. LER-78-001/03L-0 Re Hydraulic Shock Suppressor Found Inverted with Empty Reservoir

ML19095A513
Person / Time
Site:	Surry
Issue date:	02/24/1978
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	O'Reilly J NRC/RGN-II
References
Serial No. 105 LER 1978-001-03L-0, LER 1978-001-03L-O
Download: ML19095A513 (3)

LER-1978-001, Submit Licensee Event Report No. LER-78-001/03L-0 Re Hydraulic Shock Suppressor Found Inverted with Empty Reservoir

Event date:
Report date:
2801978001R00 - NRC Website

text

e

• February *24,: 1978'.

Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U. S.

Nuclear ~egulatory Corrnnission Region II - Suite 818 230 Peachtree Street, Northwest Atlanta, Geo.rgia 30303

Dear Mr. O'Reil-ly:

Serial No. 105 PO&M/DLB : das Docket No. so*-280 License No. DPR-32 Pursuant to Surry Power Station Technical Specification 6.6.2b(2), the Virginia Electric and Power Company hereby submits the following Licensee Event Report for Surry Unit No~ 1.

LER-78-001/03L-O This report has been reviewed by the Station Nuclear Safety and Operating Committee and will be placed on the agenda for the next meeting of the System Nuclear Safety and Operating Committee.

Enclosures (3 copies) cc:

Dr. Ernst Vo.lgenau, Director (40 copies)

Office of Inspection and Enforcement Mr. William G. McDonald, Director (3 copies)

Office of Management Information and P~ogram Control Very truly yours, zb. J11. &a:/*\\1/

C. M. Stallings Vice President - Power Supply and Production Operations

~-----

NRC FORM 366 (7-77)

U.S. NUCLEAR REGULATORY COMMISSION

• :*CENSEE EVENT REPORT CO,N};ROL BLOCK: I

- 1 10 1L..---'---'--........L-_._------'6 e

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

~

I v! Al s I P-1 s I 1 !G)I o I o I,...1 o lo lo lo I o I - Io !'o 101 4 11 I 1 I 1 ! 1101 I 10 7

8 9

LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T [uTI 7

8

')

~~~~~~ ~© I o I s I o r*-~

• 1 o I 2 I s I o

• 101 o I 2 I o I 1 I 1 I s 10 I o I 2 I 2 I 1 I 1 I s I G) 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

~

I With Unit #1 at normal full power operation, a hydraulic shock suppressor (Snubber

[)))) I 1-SHP~HSS-18) was found inverted with an empty reservoir.

This event is reportable

--[+/-BJ I per T.S. 6'.6.2b(2).

No significant occurrence took place.. This event had no adverse I [QJ]J affect upon the health and safety of-the public.

7 8 9 SYSTEM

CAUSE

CAUSE CODE CODE SUBCOOE [ill]

1c 1c I@ L.£J@ ~@

s1 7

8 9

10 11 12 13 SEQUENTIAL

@ LER/RO [:VENT YEAR REPORT NO.

REPORT I 7 I 8 I L=.I Io Io 11 I NUMBER 21 22 23 24 26 ACTION FUTURE EFFECT SHUTDOWN TAKEN ACTION ON PLANT METHOD HOURS COMf'.

VALVE COMPONENT CODE SUBCODE SUBCODE u1 P l/1 27 IO IR 1 T J@ l!J@) ~@

18 19 20 OCCURRENCE REPORT CODE TYPE 10 13 I w

L=.l 28 29 30 31 NPRD-4 FORM SUB.

PRIME COMP.

SUPPLIER REVISION NO.

LQJ 32 COMPONENT MANUFACTURER 80

~@LJ@ ~@ ~ 101010 33 34 35 36 37

{22)

ATTACHMENT hf SUBMITTED I I LB@

40 41

~@ ~@ 11 I 2 IO 17 I@

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS@

42 43 44 47 j Steady state vibration loosened the lock nut on the snubber support arm, This all owed I

, [JJJJ I the support arm and snubber to roll 180°.

With the snubber inverted, the reservoir I emptied.

The snubber was immediately replaced with a new snubber (Serial i/3073) and ITIII -

OJ}] I the lock nut tightened to prevent reoccurrence.

[III]

7 8

9 FACILITY STATUS

% POWER OTHER STATUS [ill]~@ [l 10 10 1@1-I _N_/A ___ ~

@)

80 METHOD OF A

DISCOVERY DISCOVERY DESCRIPTION '2_v

~@)LI _O_p:...._e_r_a_t_o_r_O_b_s_e_r_v_a_t_i_o_n _________ _.

7 45 46 80 8

9 10 12 13 ACTIVITY CONTENT

~

RELEASED OF RELEASE AMOUNT OF ACTIVITY ~

ITliJ w @) ll_J(§),__I ---=N/=A,_____ __

7 8

9 10 11 44 44 45

• N/A LOCATION OF RELEASE @

80 PERSONNEL EXPOSURES

~

NUMBER r:;:;,. TYPE

DESCRIPTION

[I.El 10 I O I OJLi@L--.:N~/.:..:.A _____________________

7 8

9 11 12 13 BO PERSONNEL INJURIES Q

NUMBER DESCRIPTION~

IT:GJ I O j O I O l@i__ ___

__;N/_A _____________________

7 8

9 11 12 80 LOSS OF OR DAMAGE TO FACILITY '43\\

TYPE

DESCRIPTION

~

~

Ll@L N/A 8

9 10 80 1ssu:~~~;;CRIPTION@

NRC USE ONL y ITI9] Li6t---______

N/_A _____________

--J I I I I I I I I I I I I I !

7 8

g*

10 68 69 80;;;

T. L. Baucom NAME OF PREPAREH (804) 357-3184 PHONE:-------------

0 ll C)

.- '>\\,,;,.. ~-

e I' *tE{ - _Q_ _Q_ _L / 03_ - L - 0 VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION, UNIT #1 DOCKET NO: 050~0280'..

EVENT DATE: 02-01-78 8

. During normal full power operation a snubber (l-SHP-HSS-18) on_Main Steam Line "C" was found* inv-ert'ed*:with an *empty reservoir.

The_ lock nut, which -holds the support

.arm in position, loosened and allowed the support arm and snubber to roll 180°.

The loosening of the lock nut was caused by steady state vibration in the main steam line.

Maintenance and Quality~Control personnel immediately evaluated the situation.

To*

reduce maintenance time, a new snubber, Serial Number 3073, tested in accordance with MMP-P-HSS-020, was substituted for the inverted snubber.. The lock nut was tightened to prevent reoccurrence.

The Maintenance Report was completed at 1630-hours on 02-01-78.

This event did not affect the health and safety of the public.

All other snubbers w~th this configuration were checked and found to be satisfactory.