05000220/LER-1978-035-01, /01T-0 on 781020:all Main Steam High Flow Pressure Indicating Instr Were Found W/Setpoints Less than Tech Specs.Heise 0-200 PSIG Test Gauge Calibrated & Used in Test Had Loose Screw & Was Recalibrated

/01T-0 on 781020:all Main Steam High Flow Pressure Indicating Instr Were Found W/Setpoints Less than Tech Specs.Heise 0-200 PSIG Test Gauge Calibrated & Used in Test Had Loose Screw & Was Recalibrated

ML19274C716
Person / Time
Site:	Nine Mile Point
Issue date:	11/01/1978
From:	Macvittie D NIAGARA MOHAWK POWER CORP.
To:
Shared Package
ML17053A221	List: 05000220/LER-1978-035, Forwards LER 78-035/01T-0 05000220/LER-1978-035-01, /01T-0 on 781020:all Main Steam High Flow Pressure Indicating Instr Were Found W/Setpoints Less than Tech Specs.Heise 0-200 PSIG Test Gauge Calibrated & Used in Test Had Loose Screw & Was Recalibrated
References
LER-78-035-01T, LER-78-35-1T, NUDOCS 7811090273
Download: ML19274C716 (4)

LER-1978-035, /01T-0 on 781020:all Main Steam High Flow Pressure Indicating Instr Were Found W/Setpoints Less than Tech Specs.Heise 0-200 PSIG Test Gauge Calibrated & Used in Test Had Loose Screw & Was Recalibrated

Event date:
Report date:
2201978035R01 - NRC Website

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LICENSEE EVENT REPORT 44 CONTROL BLOCK: l l

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60 61 DOCKET NUV8ER 68 63 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o

During steady state operation, performance of N1-ISP-RE22 found all o

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[ vious cal. on 10-10-78. Condition has minimal safety implications.

I Other int.trumentation would initiate same response.

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o l A Heise 0-200 PSIG test gauge was calibrated and used in the surveil-I i, iij lance tests. Subsequently, it was found to have a loose screw inter-1 nally, and recalibrated. RE22s were retested and all were readjusted.

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'~ ( ) NIAGARA MOHAWK POWER CORPORATION /300 ER!E BOULEVARD WEST. SYRACUSE. N.Y.13202/ TELEPHONE (315) 474-1511 November 1, 1978 Att. Boyce H. Griet Directo.1 Un Ited States Nuelcat Regulatory Commission Region I 631 Park Avenue King of Prussia, PA. 19406 RE: Docket No. 50-220 LER 78-035/01T-0 Nine blite Poistt Nuclear Station Unit #1

Dear kLt. Grist:

During s.teady state opetation, performance of N1-ISP-RE22 found att .igitt pressure indicating steitclies toith setpoistts Less costservative than alloteed by Teclutical Specification 3.6.2b. Titis specification requires a setpoistt of less than or equal to 105 psid +/-1 psid. The Main Steam Line H.igh Floto setroists secre found and Left at the folloteing values on Octobst 20, 1978: Insttamestt Found (psid) Left (paid) RE22A 107.0 104.5 RE228 107.0 105.0 RE22C 106.5 105.0 f'1G RE220 108.0 105.0 RE22E 106.2 105.0. RE22F 108.5 104.5 RE22G 108.5 104.5 A RE22H 107.5 105.0 A review of.the RE22 Surveillance Test records indicated that a drift as latge as fowid in.this instance tats rare for one insttument, and had never occatted on att eight. In addition, the Heise 0-200 psig . test gauge leas calibrated on Octobst 10, 1978 and fow1d.to have been in error. As a precaution, the Heise gauge leas recalibrated, and the sur-vexilance. test repeated on October 27, 1798.

~ The RE22's leere fow1d at the folloteing setpohits: Insttumestt Found (psid) RE22A 103.0 RE228 103.5 RE22C 103.5 RE220 103.0 RE22E 103.0 RE22F 103.5 RE22G 103.0 RE22H 103.5 During.the one tecek betecen tests, it is highty unlikely.that att histtuments teould again have drifted an average of 1.5 ysid (titis time in a more conservative direction). This apparent change in setpoistt is being attributed.to a loose screa lawtd internally during Die tast cat-ibration. Assuming.that the initial event teas caused by a. test gauge reading 1.5 psig stigh, the corteeted "fowid" and "Lef.t" values for the October 20, 1978 tests are as follotes: Cortected Corteeted Iststtumeitt Found ipsid) Left (psid) RE22A 105.5 103.0 RE226 105.5 103.5 RE22C 105.0 103.5 RE220 106.5* 103.5 RE22E 104.7 103.5 RE22F 107.0* 103.0 RE22G 107.0* 103.0 RE22H 106.0 103.5

• Conttary.to Techstical Specification 3.6.2b r

The drifts noted on tittee insttuments are more in Lint teith Ltends established over the last. ten moittits. TItis condttion has minimat safety implications because outly one out of four insttume>tts must Ltip in each channel to ist<tutte MSIV closure, and five oBier insttuments icould Itave functioned. In the event Bia.t all e,igitt insttument teere, in fact, less conser-vative,.three other iststtumeitt systems (Lote Conde tser Vacuum, Main Steam Line Higit Raduttion, and Main Steam Line High Temperature) teotttd have initiated the MSIV closure. Procedures have been changed to establish a guide value of 100 psid +/-2 psid for.the setpoint tehen performing N1-ISP-RE22. Titis teilt permit insttument drifts of the magnitude experienced, teithout degrading Bie sys. tem's response. Vety Ltuty yours, Original Signed by R.R. Schneider R.R. Sclineider Vice President - Eteetric Production mbn }}