05000281/LER-1979-002-03, /03L-0 on 790120: During Normal Operation Channel Check Revealed That Pressurizer Pressure Channel I Drifted Above Tech Spec Limit as Compared to Channels II & Iii. Caused by Failure of Channel I Pressure Transmitter

/03L-0 on 790120: During Normal Operation Channel Check Revealed That Pressurizer Pressure Channel I Drifted Above Tech Spec Limit as Compared to Channels II & Iii. Caused by Failure of Channel I Pressure Transmitter

ML18113A850
Person / Time
Site:	Surry
Issue date:	02/15/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18113A849	List: 05000281/LER-1979-002, Forwards LER 79-002/03L-0 & 79-003/03L-0 05000281/LER-1979-002-03, /03L-0 on 790120: During Normal Operation Channel Check Revealed That Pressurizer Pressure Channel I Drifted Above Tech Spec Limit as Compared to Channels II & Iii. Caused by Failure of Channel I Pressure Transmitter 05000281/LER-1979-003-03, /03L-0 on 790122: Following Containment Entrance Equipment Hatch Escape Airlock,Outer Door Was Not Proven Sealed within 72-h from Initial Opening.Caused by Problems in Sealing Exterior Hatch
References
LER-79-002-03L-02, LER-79-2-3L-2, NUDOCS 7902220096
Download: ML18113A850 (2)

LER-1979-002, /03L-0 on 790120: During Normal Operation Channel Check Revealed That Pressurizer Pressure Channel I Drifted Above Tech Spec Limit as Compared to Channels II & Iii. Caused by Failure of Channel I Pressure Transmitter

Event date:
Report date:
2811979002R03 - NRC Website

text

(7-77)

LICENSEE EVENT REPORT CONTROL BLOCK:.____,__~_.____,~~'-~' 8 (PLEASE PRINT OR TY.LL REQUIRED INFORMATION) 6

~

I V I A I s I p I s I 2 101 0 I O I - I 0 8

9 LICENSEE CODE 14 15 I o I o I o I o I -I ol 0101 41 11 11 11 1101 I 10 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T

~

7 8

~:~:~~~*- L!JG)I o I s I o I o I o I 2 I s 11 101 -01 11 21 -o!

71 91©! o!

21 11 sl 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 71 9IG)

BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

j During nomal operation, a channel check revealed that Pressurizer Pres sure Channel.

I drifted above the Technical Specification limit as compared to Channels II and III.f This drift would have resulted 1.n reactor protection--signals from this channel--of 5 psi below setpoints delineated in Tech. Spec. 3*. 7.

This event 1.s reportable per Tech!

[QJ]J Spec. 6.6.2.b.L The*health and safety of the general public were not affected.

8 9 SYSTEM CODE

@TI]

8

• ,II BI@

9 10 Q

LE R/RO CV ENT YEAR

~

REPORT 17 I 9 j NUMBER 21 22

CAUSE

CAUSE CODE SU8CODE COMPONENT CODE

~J@ Lu@ I II NI sl Tl RI ul@

11 12 13 18 SEQUENTIAL OCCUR REN CE REPORT NO.

CODE L=.l I 01 Oj 2J J/I g ~

23 24 26 27 28 29 COMP.

SUBCODE LIJ 19 REPORT TYPE

~

30 VALVE SUBCODE w@

20 l=:.I 31

~

ATTACHMENT ACTION FUTURE EFFECT SHUTDOWN TAKEN ACTION ON PLANT METHOD HOURS NPRD-4 FORM SUB.

PRIME COMP.

SUPPLIER REVISION NO.

LQJ 32 COMPONENT MANUFACTURER 80

\\..:;I SUBMITTED 1° I L2J@)

40 41

~@LU@ LU@

LU I_O 10 10 33 34 35 36 37

~ ~@) I Fl 11 21 01@

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

• 42 43 44 QJI] L]'his event was caused by failure of the Channel I Pressure transmitter.

Channel I [JJJJ !pressurizer Pressure and Channel I Overtemperature Delta T were placed in the trip o:J2J jmode to provide the required degree of redundancy.

The transmitter was replaced, CiJ2) tested, and Channel I was returned to service.

8 9

FACILITY STATUS

% POWER*

OTHER STATUS @

METHOD OF A

47 J

80 [iJ}J ~@

lj 01 Ol@)I.._ __

NA ___

DISCOVERY DISCOVERY DESCRIPTION '2_v

~@... I _O_p=--e_r_a_t_o_r_o_b_s_e_r_v_a_t_1._* o_n __________ __.

8 9

10 12 13

. ACTIVITY CONTENT Q

RELEASED OF RELEASE AMOUNT OF ACTIVITY

~w ~@ ~@1 NA 7

8 9

10 11 45 46 44 80 NA LOCATION OF RELEASE @

44 45 80 PERSONNEL EXPOSURES c;;;,.

NUMBER TYPE DESCRIPTION~

r, [iJ j O I O j oJ@)~@...__N_A _____________________

8 9

11 12 13 80 PERSONNEL INJURIES Q

NUMBER DESCRIPTION~

Gli] j O I O I O l@L ___

N_A __________________ -'---------J 8

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

DESCRIPTION

'::::;)

[III)~@

NA 8

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

790222C)t>Cf ~

NRC USE ONL y

<D ITI§] ~@...._ __

N_A __________________

II II I I II II II I ~

8 D

10 68 69 80 o, NAME OF PREPARER w. L_._s_t_e_w_a_r_t _______ '-----

PHON E: __

(8_0_4_)_3_5_7_-_3_1_8_l* ___ _ ci n.

t!)

~ (Attachment, page 1~ 1)

Surry Power Station~nit 2 Docket No.:

50-281 Report No.:

79-002/03L-0 Date:

1/20/79 P~essure Indicator (PI-455) Reading hi~h

1.

Description of Event

During normal operation, a channel check revealed th~t Pressurizer Pressure Channel I drifted above the Technical Specification limit as compared to Channels II and III.

This drift would have resulted. in reactor protection signals from this channel of 5-psi *below set points delineated in Tech. Spec. 3.7.

This event is reportable per'--Tech. Spec.

6.6.2.b.l.

2, Probable Conseequences:

Immediate corrective action taken was to place the Pressurizer Pressure (Protection) Channel I and the Overtemperature Delta T Channel I in the trip mode.

This provided all affected systems with the required degree of redundancy.

Because the necessary actions were taken to maintain the r.equired instrument operating conditions, the health and safety of the general public were not affected.

3.

Cause

The event was caused by failure of the pressure transmitter.

4,

Immediate Corrective Action

Immediate corrective action taken was to place the Pressurizer Pressure (Protection) Channel I and the Overtemperature Delta T Channel I in the trip mode.

5.

Subsequent Corrective Action:

The pressure transmitter was replaced, tested and the channels returned to normal mode.

6.

Action Taken to Prevent Recurrence:

This failure is considered a random event, therefore no further action will be taken.

7.

Generic Implications:

Since this is considered a random failure, ther~ are no generic-~~

implications.