ML20085F325

AO AO-75-9:on 741223,three Reactor Trip Pressure Switches, PS-1801,PS-1802 & PS-1803 Found Out of Calibr.Caused by Use of Incorrect Procedure for Switch Calibr.Instrument Index Revised to Ref Proper Tech Spec Section

ML20085F325
Person / Time
Site:	Palisades
Issue date:	04/28/1975
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Office of Nuclear Reactor Regulation
References
AO-75-9, NUDOCS 8308220055
Download: ML20085F325 (3)

Text

___________- ____-__-________ _ __ _

o o fscq$ CORSum8IS

'-) h(

W

,1) Power j7 Company NM/

Ih'i L General Offices: 212 West Machigan Avenue, Jackson, Michsgan 49201 e Area Code S'7 7H8 05SO April 28, 1975 x

/.' /,e ,

/7 c e 9

_. v s. , _.

c- V if x

,- /

~N/

's ~ ';.

Re: Docket 50-255' 2;;'k Division of Reactor Licensing US Nuclear Regulatory Commission License DPR-20 War hington, DC 20555 Palisades Plant A0-75-9 Gentlemen:

l Attached is Abnormal Occurrence Report A0-75-9 This occurrence was not recognized or designated to be an abnormal oc-currence until April 17, 1975 The analysis of the occurrence O

N.)

concluded that there was no significant effect on safety.

Yours very truly, Ralph B. Sewell (Signed)

DAB /mel Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USNRC 3 '],'0 (V

n.

8308220055 750420 PDR ADOCK 05000255 PDR g

I .__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

O O O

ABNORMAL OCCURRENCE REPORT Palisades Plant

1. Report Number: A0-75-09, Docket 50-255

2. a. Report Date: April 25, 1975

b. Occurrence Date: April 17,1975 (desie;nated an abnortial occurrence).

3. Facility: Palisades Plant, Covert, MI.

h. Identification of Occurrence: Containment high-pressure switch out of calibration.

5 Conditions Prior to Occurrence: On December 23, 1974, when thr2e out of four high-pressure switches were observed to be above the Technical Specifications limit, the plant was in a shutdown condition.

6. Description of Occurrence: While performing refueling Surveillance Procedure M-VAS-2 containment high pressure on December 23, 1974, it was found that three of the four reactor trip pressure switches (PS-1801, PS-1802 and PS-1803) were above the Technical Specifications limit (Table 2.3 1) of less than or equal to 5 psig by 0.2 to 0 3 psig.

The switch settings were immediately corrected. However, this was not recognized as a reportable incident until April 17, 1975 due to the press of other activities.

7 Designation of Apparent Cause of Occurrence: When these switches were re-placed (see A0 letter dated 3-26-74) during July 1974, their subsequent calibration was performed using "Nomal Maintenance Procedure M-MSI-5 Basic Pressure Switch Calibration and the Instrument Index" instead of the

" Refueling Surveillance Procedure M-VAS-2." The instrument index set point called for a 5 psig set point instead of 4.8 psig as per the sur-veillance procedure.

8. Analysis of Occurrence: The use of the incorrect maintenance procedure was the result of a human error. The out-of-calibration condition existed for only one month of power operation, October 1974. Due to the small error relative to the containment design pressure, we conclude that this occurrence had no significant effect on safety.

9 Corrective Action:

a. Revise instrument index to reference proper section of Technical I Specifications rather than an absolute number.

b. Revise remarks statement in surveillance procedures to read "if as-O found tolerances are outside expected band, report to I and C V Engineer for prompt initiation of an abnormal occurrence report, if required."

. . . . . . . - . . _ - - ~ - - - . . . ~ . _ - - . . . - . . . - . - . - - . _ . _ - _ . - - - . - - . - _ _ _ _ _ _ _ _ _

. . . . . ~ . . . . . . - . . - . - .

l*'- e e b

4 i

I e 9 Corrective Action: (Contd)

c. Revise the surveillance procedure set point to allow for an 0.3 psig

set 1,oint drift instead of the present 0.2 psig allowance.

l i 10. Failure Data: Not applicable.

I l

1 f

l

! i i

j 9 .;

< i i

t .

I ,

i l

I '

I O

2 i

_ _ _ _ _ _ _ . . _ _ _ - . _ ._ _ _ _ _ _ _ _ _ _..~.__ __ ______ _ _ _ _ _ _ _ _ _ _