05000366/LER-1981-075-03, /03L-0:on 810812,hydraulic Control Unit Accumulator Low Pressure Alarm Received for Control Rod 26-47.Cause Undetermined.Accumulator Recharged & Returned to Operable Status

/03L-0:on 810812,hydraulic Control Unit Accumulator Low Pressure Alarm Received for Control Rod 26-47.Cause Undetermined.Accumulator Recharged & Returned to Operable Status

ML20010E762
Person / Time
Site:	Hatch
Issue date:	08/25/1981
From:	Baxley S GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010E758	List: 05000366/LER-1981-075, Forwards LER 81-075/03L-0 05000366/LER-1981-075-03, /03L-0:on 810812,hydraulic Control Unit Accumulator Low Pressure Alarm Received for Control Rod 26-47.Cause Undetermined.Accumulator Recharged & Returned to Operable Status
References
LER-81-075-03L-01, LER-81-75-3L-1, NUDOCS 8109080226
Download: ML20010E762 (2)

LER-1981-075, /03L-0:on 810812,hydraulic Control Unit Accumulator Low Pressure Alarm Received for Control Rod 26-47.Cause Undetermined.Accumulator Recharged & Returned to Operable Status

Event date:
Report date:
3661981075R03 - NRC Website

text

-

NRC FORM 366 U. S. NUCLE AR REGUL ATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: [ l l

l l

l l

(PLEASE PRINT OR TYPE ALL REQUtRED INFORMATION) 1 6

l Gl Al El Il Hl 2 l@l 0 l 01 - l 0 l 0 l 0 l 0_l 0 l-l 0 l 0 l@l 4 l1 l 1 l1 l 1 l@l l

l@

o i 7

8 9 LICENSEE CODE 14 ib LICENSE NUMBER 26 26 LICENSE TYPE Jo bF CAT 68 CON'T IOlil S= LL_J@l 015 l 0 l 0 l 0 l 3 l 6 l 6 l@l 0 l 8 l 1 l 218 l 1 l@l 01812151 B l l l@

7 8

60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBA6LE CONSEQUENCES h i

l While operating at 87% power the HCU accumulator low pressure alarm was received for l lOl2l l control rod 26-47. Tech. Specs, section 3.1.3.5 requires actuation at 955 i 15 psi.

l 0 3 [O j. ; l 0perations personnel were dispatched to recharge this accumulator. This is a re-

[

lOisl l petitive occurrence (Ref. LER 50-366/1981-040). There was no effect on the public l

O o I health or safety.

l 10171 l i

10181 l l

7 8 9 80 C OE CODE SUBC E COMPONENT CODE SUBC DE S

E i LO_19_J l Rl Bl@ -Lx_J@ WO Iz iz lz lz iz iz i@ t_zj@ w @

SEQUENTIAL OCCURRENCE REPORT REVISION LE R EVENT YE AR REPORT NO.

CODE TYPE N O.

O" s g'RO la 11 l l _j l0l7l5l y

l0 l3 l W

l-l W

a 21 22 23 24 26 27 28 29 30 31 32 AK N A T ON ON PL NT MET HO'JRS 22 SE IT FOR B.

SUPPLI MAN F C RER l X I@Lz_J@

Lz_J@

tz_j@

1010l010i gg ogizl@

lz l9 l9 l9 l@

1 J3 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lilal1 Control Rod 26-47's accumulator pressure had bled down to approximately 960 psig.

l l Operations personnel recharged accumulator and returned this accumulator to operable l t

i i I status at 0820 8-12-81.

l

, 2 11131 l I

i i 4 l

l 7

8 3 80 ST IS

% POWER OTHER ST ATUS Dis O RY DISCOVERY DESCRIPTION LEj@ l 0 l 8 lE@l N/A l

lBl@l Operator Observation l

1 s l

0 ACTIVITY CO TENT RELFASED OF RELE ASE F ACTIVITY LOCATION OF RELEASE y @ Wgl AMOUNTi/A l

l N/A l

t t

i c

'S 8

PERSONdL nPOS Iits l

NUMBER TYPE

DESCRIPTION

10 l010 l@[z_j@l N/A l

i 7 So PtRSOnNd'iN;u'JiES l 0 l 0 lR0lglEsCniPTiON@

Nu 48E o

N/A l

i R 7

8 9 11 12 80 T,S

" fSC^"^?1 ON' ' ' ^ " " @

' S '

E IT Tl lzj@l N/A l

I i

7 H 9,

10 80 i

8109080226 810825 NRC USE ONLY DRADOCKOSOOOg N/A l

lllllllllllll NAME Oc PREPARER PHONE:

m

LER #:

50-366/1981-075 Licensee: Georgia Power Company Facility Name:

Edwin I. Hatch Docket No. 50-366

Narrative

Report for LER E0-366/1981-075 While operating at 87% power on 8-12-81 at 0608 CDST, the accumulator lcw pressure alarm was received for control rod 26-47.

Personnel were sent to recharge the accumulator.

Accumulator pressure had decreased approximately 960 psig. The accumulator was recharged to 1100 psig

+a at 0820 CDST 8-12-81.

Shift personnel could not determine the cause of pressure reduction for this accumulator.

Control rod 26-47 was returned to operable status following recharging of c cumulator.