ML19031B053

LER 1977-035-03 for Salem Unit 1 Inoperability of Pressurizer Level

ML19031B053
Person / Time
Site:	Salem
Issue date:	06/02/1977
From:	Librizzi F Public Service Electric & Gas Co
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1977-035-03
Download: ML19031B053 (4)

Text

Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000 June 2, 1977 Mr. James P. O'Reilly Director of USNRC Office of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. O'Reilly:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 77-35/03L Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 77-35/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

~/v(~-f,.,"

Frank P. Libriz91' General Manager -

Electric Production CC Director, Office of Inspection and Enforcement (30 copies)

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

The Energy People 95-2001 (400M) 6-76

Report Number: ~35/03L Report Date: 5/20/77 Occurrence Date: 5/7/77 Facility: Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Pressurizer Level Channel I Inoperable CONDITIONS PRIOR TO OCCURRENCE:

Mode 3, Tave 547°F, Pressure 2235 psig DESCRIPTION OF OCCURRENCE:

At 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br />, pressurizer level channel I was declared inoperable due to it reading 3 to 5% higher than other channels. Pressurizer level channel I was placed in the 'tripped condition. Action State-ment No. 7 for LCO 3.3.1.1, Table 3.3.1 and Action Statement A for LCO 3.3.2.l were placed in effect. Power operation continued until 5/18/77 when the unit was taken out of service to repair the channel.

DESIGNATION OF APPARENT* CAUSE OF OCCURRENCE:

Two problems were identified that caused this occurrence. Gas was trapped in condensate pot causing a false high level signal. Addi-tionally, the low pressure isolation valve and the equalizing valve were found to be leaking through. With the equalizing valve leaking through a false differential pressure signal was being applied to the transmitter.

ANALYSIS OF OCCURRENCE:

Action Statement No. 7 for LCO 3.3.1.1 and Action Statement A for LCO 3.3.2.1 allow operation to continue until the next required functional test provided the inoperable channel is placed in the tripped condi-tion within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. Channel I pressurizer level was placed in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, therefore, the LCO was not violated.

The function test for this channel was due on 5/19/77. At no time was there any danger to the health and safety of the general public or site personnel.

CORRECTIVE ACTION:

On 5/18/77, the unit was placed in Mode 2 to facilitate venting of the pressurizer level condensate pot. The pot was vented and the indica-tion decreased to approximately 3%. The equalizing valve and low side

Report No. 77-3S/03L 5/20/77

• e isolation valve were replaced and the channel output came to within 2 millivolts of other operable channels. Channel I was declared operable and all action statements terminated.

FAILURE DATA:

Not Applicable Prepared by T. Spencer

~~~~~=--~~~~~

Manager _I/Salem Generating Station SORC Meeting No. 57-77

~~~~~~~~-

77-35/03L

, ' 5/7 /77 LICENSEE EVENT REPORT

• CONTROL BLOCK 6

!_ICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT OATC:

f011l CON'TL_Lj LlJ UJ I 0 I 51 0 I -I 0 I 21 71 21 I0 I 5 I 0 I 7 I7 I 7 I I 0 I 5 I 2 I 0 j7 I 7j r--""1 57 58 59 60 6, 68 69 74 75 EVENT DESCRIPTION

~I During Mode 3 operation, Channel I pressurizer level was declared inopert 7 8 9 so

@))!able due to it indicating 3-5% greater than other operable channels.

1 as

@))!Channel I was placed in the tripped condition and Action Statements for J

7 8 9 J

~ILCO 3.3.1.1 & 3.3.2.1 were implemented. Condensate pot was vented and I 7 8 9 00

~!equalizing valve was replaced. (77-35/03L) l 7 8 9 . PRIME COMPONENT COMPONENT so SYSTEM CAUSE cooE . cooE COMPONENT CODE SUPP!_IER MANUFACTURER VIOLATION

@E]LLllLJ ~ IX IX IX IX IX..JXJ LbJ IZ!9i9191 LBJ 7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION

@:01 Gas trapped in the condensate pot caused a false high level signal. Leal!:-

~9 &>

l2Jfil I age thru the equalizing valve on the 6P transmitter attributed to the I 7 s9 BO

[!]£]I false level indication. I 7 8 9 ao FACILITY MET HOO OF STATUS '!<.POWER OTHEfl STATUS DISCOVERY 01scov*ERY pESCRIPTION ITEla LUJ. IO 10 IO I IL:-~N~;_.A~~--.J' l_g,J N;A 1 s 10 12 13 44 45 so FORM OF ACTIVITY CONTENT

~

1 a s w

RELEASED OF RELEASE w10 11 AMOUNT OF ACTIVITY l~_ _ _N__:./_A_ __JI 44 I

LOCATION OF RELEASE NI A 4'="5:---------'--,;.._-------~oo I

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~1010101 1 as 11 lZJ 12 NA 1b3;-----~<-.,;;..;=---------------------------=:!so PERSONNEL INJURIES NUMBER DESCRIPTION GEJIOIOIOI NA 1 a9 11 12 so OFFSITE CONSEQUENCES

~ .

NA LOSS OR DAMAGE TO FACILITY G:@l9~i 1 a ICESCRIPTION

~10.-----~----_::.;.L....;;..;;..._

N/A _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___,....

PUBLICITY

@iJ 7 8~9------------...U.,<-C~------------------------80~

ADDITIONAL FACTORS II@'n-~~~~~~~~~-N==-~A'--~~~~~~~~~~~~~~~~~~~..,.,i 7 8 9 o::lil~~~~~~~~~~~~~~~~~~~~~~~~~~~~_;_~~~~..;.....J 7 89 00 NAME: T." L. Snencer =-='------

PHONE: (609) 365-7000 Ext. Salem 628