ML18030A210

Final Deficiency Rept Re GE Pneumatic Timing Relay Setpoint Drift,Initially Reported on 800711.Affected Relays in Automatic Depressurization & Core Spray Sys Will Be Replaced.Final Rept Re Agastat Relays by 810529

ML18030A210
Person / Time
Site:	Susquehanna
Issue date:	02/11/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, ER-100450, ER-100508, PLA-616, NUDOCS 8102180509
Download: ML18030A210 (6)

Text

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ACCESSION NoR:8102180509 DUC ~ DATE: 81/02/11 NOTARIZED: tlO DOCKET ¹ FACIL:50-5d7 Susquehanna Steam Electric Station< Unit i~ Pennsyl va 0 5.0 0..0.38-50-3o8 Susquehanna Steam Electric Stations Unit 2i Pennsylva 00388 AIJTii,,"4 Al")E AU THOR Af'F ILIA I ION CURTIS< N. >!. Pennsylvania Power 8 Light Co ~

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GR IER < o ~ ti, Region Philadelphia< Office of the Director

SUBJECT:

l-inal aeficiency rept re GE pneumatic timing relay setpoint drift,initially reporteii on 800711.Affected relays in automatic depressurization 8, core spray sys will oe replaceo.Fina! rept re Agastat relays by 81(529.

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PPaL TWO NORTH NINTH STREET~ ALLENTOWN~ PA I8 I 0I PHONEr (2 I 5) 770 5 I 5 I NORMAN W. CURTIS Vice President ~ Engineering 8 Construction-Nuclear 770.5381 February 11, 1981 Mr. Boyce H. Grier

- Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 SUSQUEHANNA STEAM ELECTRIC STATION STATUS UPDATE OF A DEFICIEN Y RELATING TO AGASTAT AND GENERAL ELECTRIC TIMING RELAYS ERs 100450/100508 PILE 840-4/900-10 PLA-616

Reference:

PLA-508 (7/11/80)

Dear Mr. Griers This letter serves. to .supplement the .'above. referenced correspondence..

which advised the Commission of a deficiency "relating'"to.pneumatic time delay relays.

The attachment to this letter contains a final report on the defective General Electric CR2820 relays. We expect to provide a final report on the Agastat relays prior to May 29, 1981.

We trust the Commission will find the information forwarded by this letter to be satisfactory.

Very truly yours, N. W. Curtis Vice President-Engineering a Construction-Nuclear Attachment PLW:sab Pp(V 5

PENNSYLVANIA POWER 8 LIGHT COMPANY C~

8-202X 8g ~

Mr. Boyce H. Grier February ll, 1981 cc: Mr. Victor Stello (15)

Director-Office of Inspection a Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Office of Management Xnformation a Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P.O. Box 52 Shickshinny, PA 18655

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~sub 'st General Electric pneumatic timing relay set point drift.

Zn BWR Services Information Letter, SIL No. 230 Category 1, dated June 6, 1977 and SZL No. 230 Supplement No. 1 Category 2, dated December 30, 1977, GE recommends replacing the GE Model CR2820 pneumatic timing relays in the ADS I RHR I and Core Spray systems with the Agas tat TR Series solid s tate timing relays. The reason given is that the GE pneumatic timers may exhibit set point drift, increasing the time delay, on the first pickup after more than one month in the deenergized state.

Upon investigation, fifty (50) Model CR 2820 timing relays are found being used at Susquehanna, 25 on Unit I and 25 on Unit II. For each Unit there are 12 timing relays in the RPS, one (1) timing relay in the HPCI system, one (1) timing relay in the RCZC system, two (2) timing relays in the Reactor Water Clean-up System, one (1) timing relay in the Feedwater Control System, two (2) timing relays in the ADS, four (4) timing relays in the Core Spray System and two (2) timing relays in the RHR System.

Cause The cause of the drifting set point, as described above, has not been defined.i The condition appears to be a generic trait among pneumatic time delay relays.

Anal sis of Safet lm lications a Zt was determined that, for each Unit, the -two '(2) relays" in the ADS -'and four (4) relays in the Core Spray System would require replacement. The remaining relays do not require a change because precise timing is not critical for safe plant operation.

The relays used in the ADS control the High Drywell Pressure/RPV Low Level Logic and Alarms. These relays are 'used in the control circuits for the ADS Solenoid Valves, which actuate the relief valves, thereby relieving high pressure in the Reactor. Extended operating time of these relays could affect the safe operation of the nuclear power plant.

The relays in the Core Spray System are used in the starting circuits for the Core Spray Pumps. The Core Spray Pumps are required for the safe shutdown of the Unit in the event of certain postulated accident conditions. Extended operating time of the relays would mean an extended time in starting the Core Spray Pumps, and, subsequently a delay in providing adequate core cooling.

Project Engineering has determined that, if the conditions described had gone uncorrected, it would adversely affect the safe operation of the plant, and therefore, is reportable under the requirements of 10 CFR 50.55(e) .

Attachment to PLA-616 Page 1 of 2

Corrective Action The affected relays used in the ADS and Core Spray Systems, on both Units, will be replaced with Agastat TR Series solid state timing relays. We expect to complete Unit 1 replacements, based upon parts availability, in Jay 198].. PPGL NCR 81-069 controls Unit 1 GE relaysg Bechtel NCR 7103 controls Unit 2.

Conclusions

'he use of the Agastat TR Series solid state timing relays will eliminate the drifting set point problem on initial pickup for infrequent relay operations.

Attachment to PLA-616 Page 2 of 2

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