05000255/LER-1979-042-01, T-0:on 791012,during Testing of Pressurizer Code Safety Valves,Lift Setting for Two Valves Were 2,897 & 2,462 Psia,Violating Tech Specs.Caused by Mispositioning of Alignment Pin.Future Testing Will Be Done W/Steam

T-0:on 791012,during Testing of Pressurizer Code Safety Valves,Lift Setting for Two Valves Were 2,897 & 2,462 Psia,Violating Tech Specs.Caused by Mispositioning of Alignment Pin.Future Testing Will Be Done W/Steam

ML18043B123
Person / Time
Site:	Palisades
Issue date:	10/26/1979
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML18043B124	List: 05000255/LER-1979-042, Forwards LER 79-042/01T-0 05000255/LER-1979-042-01, T-0:on 791012,during Testing of Pressurizer Code Safety Valves,Lift Setting for Two Valves Were 2,897 & 2,462 Psia,Violating Tech Specs.Caused by Mispositioning of Alignment Pin.Future Testing Will Be Done W/Steam
References
LER-79-042-01T, LER-79-42-1T, NUDOCS 7910300198
Download: ML18043B123 (3)

LER-1979-042, T-0:on 791012,during Testing of Pressurizer Code Safety Valves,Lift Setting for Two Valves Were 2,897 & 2,462 Psia,Violating Tech Specs.Caused by Mispositioning of Alignment Pin.Future Testing Will Be Done W/Steam

Event date:
Report date:
2551979042R01 - NRC Website

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PALISADES PLANT NRC FORM366 17-771 U.S. NUCLEAR. REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: I

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION!

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60 51 DOCKET NUMBER 58 1111 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

I During testing o:f _pressurizer code safety valves, it was determined

([I!) 1 that the lift settings for two of the valves were 2897 psia (RV 1039)

(.Q:TI] I and 2462 j>sia (RV 1040).

T.S. 3.1. 7A requires the lift settings to be

((IT) 1 between 2500. psi~ and 2580 psi a. ( + /- 1%).

The li'ft setting o:f the

[))!] I third code sa:fety valye was within specs.

No similiar :failures have

. f 1I1IJ 1.. occurred in the past; All three pzr code sa:feties were tested this out-I

[)))) I age by using steam as the test fluid.

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44 47 IJ:ill I DisassembJ.y of' RV 1039 revealed that an alignment pin was mispositioned..

ITTIJ I This may have caused the out of' spec.condition of' that valve.

In o:m I addition, info f'rom the vendor reveals that testing wi ~h cold nitrogen

((II) I can :t"esult in up to 10% errors when compared to the li.ft settings with CII!) I steam as the test. medium.

Future testing will be done with steam.

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Attachment to LER 79-042/01-T-O Cons'UI!lers Power Company Palisades Nuclear Plant Docket 50-255 During the 1979 refueling outage, which is currentJ..y.in progress, all three pressurizer code s~ety valves were sent to a test facility in order to have their.lift setpoints checked with steam as the test fluid.

PreviousJ..y, testing of these valves had been performed on site and cold nitrogen had been used as the test fluid.

Two of the three valves tested had lift settings which were outside of the Technical Specifications limits.

SpecificalJ..y, RV 1039 had a lift setting of 2897 psia, and RV 1040 had a lift setting of 2462 psia.

Technical Specification 3.l.7A requires the lift settings for the pressurizer code safety valves to be between 2500 psia and 2580 psia (+/-1%).

The valve data is as follows:

• Manufacturer:

• Model No:

Dresser Industries, Inc.

DI 31739A-l The valves were disassembled, inspected, reflirbished and retested satis-factoriJ..y with steam.

Inspection of RV 1039 revealed that the alignment pin on the upper spring washer was out of its slot, and was bound on the land under the slot (see attached figure). It is probable that the misposition-ing of the alignment pin occurred during the previous rebuilding of the valve in March; 1976.

It is noted; however, that subsequent to the rebuilding of the.valve in March, 1976, it was tested satisfactoriJ..y by checking the lift setting four times with cold nitrogen.

Inspection of RV 1040 revealed no apparent deficiencies.

Information supplied by the valve vendor in August, 1979 indicates that using cold nitrogen to test the lift settings of the valves in question is not ac-ceptable.

The vendor stated that when the data from tests with steam were com-pared With data from cold nitrogen tests, differences of 8% to 10% in lift setting values were noted.

The vendor further stated that correlation of data between steam tests and cold nitrogen tests was not achievable.

Tl:~e vendor stated that this anomaJ..y was applicable specificalJ..y to the Palisades pressurizer code safety valves and did not state whether this phenomenon existed in other s~ety valves manufactured by them.

To avoid future errors in the lift settings of the Palisades pressurizer code safety valves, these valves will continue to be tested with steam as long as there exists no other practical means of testing which will provide accept-able results.

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