05000272/LER-2078-018-03, Excessive Trip Setpoint During Functional Test on PWR Range Channel N43

Excessive Trip Setpoint During Functional Test on PWR Range Channel N43

ML19031A897
Person / Time
Site:	Salem
Issue date:	04/06/1978
From:	Librizzi F Public Service Electric & Gas Co
To:	Grier B NRC/IE, NRC Region 1
References
LER 1978-018-03
Download: ML19031A897 (4)

LER-2078-018, Excessive Trip Setpoint During Functional Test on PWR Range Channel N43

Event date:
Report date:
2722078018R03 - NRC Website

text

Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000 April 6*, 1978 Mr. Boyce H. Grier Director of USNRC Off ice of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 78-18/03L 0

.. r:*.:; _,

f~~*:

Ci' c;. C::

~-:l1Jl

)"'C.J_,.~

=~~~

c-:ic.nn

l'.:rn

?)

c=;

rn

(/)

'°

--\\

o:i

~

?O. -

N

- Ci

~

\\)'!

.t>

v-1 Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1.9.b; we are submitting Licensee Event Report for Reportable Occurrence 78-18/03L.

This report is required within thirty (30) days of the occurrence.

Sincerely yours,

• 1

/"i->l

/~'- ~v-t J,,-----

F. P. Libri'zzi 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

~*.*1 ri1 C\\

P'I t:.:~

-;;:.n

<<:o

(;c:>

!'1Zi)

U"l-1 c::~

'.;l'.:CJ

{~

0 95-2001 300M 10 Report.Number:

Report Date:

Occurrence Date:

Facility:

ea-18/03L 4/6/78 3/10/78 Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Power Range High Flux Trip point Greater than allowed by Technical Specification 3.3.1.1.

CONDITIONS PRIOR T.O OCCURRENCE:

Operational Mode 1 - Reactor Power:

100%

DESCRIPTION OF OCCURRENCE:

At 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br />, during the performance of the channel functional test on Power Range Channel N43, the trip setpoint was found to be 110.4%.

This value being 1. 4% greater t_han allowed by Technical Specifications required the implementation of Action Statement 2 for LCO 3.3.1.1.

At 0840 hours0.00972 days <br />0.233 hours <br />0.00139 weeks <br />3.1962e-4 months <br />, channel N43 was placed in the tripped condition~

The detailed calibration procedure was performed and the setpoint reset and verified to be 109%.

At ~430 hours, channel N43 was declared

• operable and Action Statement 2 for LCO 3. 3.1.1 was terminated.

DESIGNATION OF APPARENT.CAUSE OF OCCURRENCE:

The ca:use of this occurrence was setpoint drift.

This is the first occurrence of setpoint drift on Power Range Nuclear Instrumentation.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.3.1.1, Action Statement 2 states that with the number of operable channels one less than the total number of channels, startup and/or power operation may proceed provided the following conditions are satisfied:

a.

The inoperable channel is 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 />.

b.

The minimum channels operable requirement is met.

c.

Either thermal power is restricted to < 75% of rated thermal and the power range, neutron flux trip setpoint is reduced to < 85%

of rated thermal power within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; or, the Quadrant Power Tilt Ratio is monitored at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

i..ER 78-18/03L Power Range Channel N43 was placed in the tripped condition within one hour and remained in that condition until it was returned to operable status.

All three (3) remaining power range channels were operable throughout this event.

Channel N43 was returned to operable status within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, therefore, monitoring of QPT ratio was not required.

CORRECTIVE ACTION

The Power Range Channel calibration was performed and channel N43 was reset to 109%.

The functional test was then completed.

FAILURE DATA:

N/A Prepared by T. L. Spencer

~~~~~~=-~....,--~~~....,--~

Manager -

s?lem Generating Statior.

SORC Meeting No.

17-78

~...,-...,-...,-...,-...,-...,-...,-...,-...,-~

---~~-~ ***-** -----------

(7-77)

LICENSEE EVENT REPORT

.,..CONTROL SLOG-K:,_I _...__...!_.._I _-_ *....__....1~18 (PLEASE PRINT OR. TY..

LL REQUIRED INFORMATION) 1 6

[ill IN !J Is I G Is I 1 101 0 I 0 I - IO* I 0 I 0 I 0 I 0 I,..1 0 I 0 IG)l 4 I 1111111101 I 10 7

a 9

l.ICENSEE CODE 14

~5 l.ICSNSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T [TITI 7

8

~~~~ I L I© I o I s I o I o I o I 2 I 7 I 2 101 o I 3 I i I o I 7 I a I@ I o I 4 I o I 6 I 7 I 8 10 60 61 DOC!< ET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES(@)

!TIIJ I During Functional Test on PWR Range Channel N43, trip setpoint found

[]JI] I 1.. 4 percent greater than allowable.

Action 2 for LCO 3. 3.1.1 imple-

((ill mented.

Channel recalibrated to 109 percent trippoint.

Action State-III))

ment terminated.

First occurrence of PWR Range Setpoint Drift.

CIEl

[§JI]

[))))

1 a 9

[§:0 7

• S SYSTEM CODE I IIAI@

9 10

(.".;\\

l.ERIRO c-VENTYEAR

~

REPORT I 7 I 8 I NUMBER 21 22

CAUSE

CAUSE COOE SUSCOOE COMPONENT COOE w@ w@ 1r1N1s1T1R1u1@

11 12 13 18 SEQUENTIAL OCCURRENCE.

REPORTN~

COOE Io 1.11 a I I......-1 I o I 3 I 2::1 24 26 27 28_

29 COMP.

suBcooE LEJ@

19 REPORT TYPE LIJ JO VAL.VE SUBCOOE

~@

20 l=l 31 TAKEN ACTION ON PLANT METHOO HOURS 22 SUBMITTED FORM SUB.

PRIME COMP.

SUPPLIER REVISION NC. w 32 COMPONENT MANUFACTURE!'l so ACTION FUTURE EFFECT SHUTDOWN

~ ATTACHMENT NPR0-4 W@W@ W@ W I o I o I o I I l!J@

L!!J@

33 34.

35 36 37 40 41 42 L!!J@

I w 111 210 I@

CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

4::1 44 47

!The cause of this event was instrument drift which resulted in the trip DID I point exceeding the-Tech Spec value.

Channel recalibrated and.returned o::rIJ to operable status.

IJE]

7 s

9 FACILITY

/3Q\\

STATUS

% POWER OTHER STATUS \\:::;:/

OE ~@ I 1 I 0 I 0 l@.... I _.......,N

..... /....,A---.___...~

8 9

10 12 lj 7

44 ACTIVITY CONTENT

(:;;;\\

RELEASED OF REL-EASE AMOUNT OF ACTIVITY DE W@ LIJ@l N/A 7

s 9

10 11 44 PERSONNEL. EXPOSURES

~

80 METHOOOF

~

DISCOVERY DISCOVERY OESCRIPTlON '51 W@I During Functional Test.

45 46 80 LOCATION OF RELEASe @

.__~~~~~~---N~/~A--~~~~~~__.l 45 so NUMBER

~TYPE

DESCRIPTION

!III! 1 o 1 o 1 o 10w@ ____

N

__ /_A _________________________

7 s

9 11 12 13 PERSONNEL INJURIES

(:;';\\

80 NUMBER DESCRIPTION~

IIIIJ I al o I ol@)'":-____ N~A----------------------~

a 9 11 12 l.OSS OF OR DAMAGE TO FACILITY 143\\

TYPE

DESCRIPTION

\\:::;/

[E] W@.

• ._NA 80 a 9 10 so PUBLICITY 0,

ISSUEDr,;-:;\\ DESCRIPTION~-

NAC USE ON l y Q

CIT2J Ui.16 N/A I I I I I I I I I I I I I ~

a 91 *a-------------------------------'68 69 so; NAMEOFPREPARER---..-T=--*-=L_. __ s;:;;.;;:o~e~n~c=-=e~r--_____ _

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

528

\\J