ML19310A298

From kanterella
Jump to navigation Jump to search
Submits Info Re Inservice Testing of Standby Liquid Control Pumps.Plant Has Been Using Flow Measurements Due to Delta P Measurement Problems.Instrumentation Is Not Installed on Sys to Measure Flow.Procedure Revised
ML19310A298
Person / Time
Site: Hatch Southern Nuclear icon.png
Issue date: 06/04/1980
From: Widner W
GEORGIA POWER CO.
To:
Office of Nuclear Reactor Regulation
References
TAC-11260, TAC-11261, NUDOCS 8006110053
Download: ML19310A298 (2)


Text

Georg a Power Cor'cany

.

  • 230 Pea & free Street Pcsf O'fece Sce 4545 Aranta Georga 30302
  • e ecncre 404 522 4060 June 4, 1980 W. A. WMne, GeorgiaPower s c;;t agGenerai Manager tr,e sournem e,ectre smem Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 NRC DOCKET 50-366 OPERATING LICENSE NPF-5 EDWIN I. HATCH NUCLEAR PLANT UNIT 2 STANDBY LICUID CONTROL PUMP INSERVICE TESTING Gentlemen:

Georgia Power Company hereby submits infonnation regardina inservice testing of Stanoby Liquid Control (SBLC) pumps at Edwin I. Hatch, Unit 2.

Please be advised that due tc, problems encountered with taking delta P measurements, the plant has been taking flow measurements instead to assure that the SBLC pumps (ASME Code Class II pumps - MPL 2C41-C001A&B) perform their intended function. Refer to Licensee Event Report 50-366/1980-050 for Hatch Unit 2 for additional background regarding delta P measurement problems.

The long-term pamp and valve program submitted for your review notes that delta P would be measured rather than flow. Instrumentation is not installed on the system itself to measure flow rate; however, provisions have been made in Hatch procedure HNP-2-3702, " Standby Liquid Control Pump Operability Test and Relief Valve Test", for taking the necessary flow measurements. As the system is of fixed resistance, it is necesary to measure deita P or flow, but not both, according to Table IWP-3100-1 of the 1974 Edition of the ASME Section XI Code with addenda through Summer 1975. Hatch procedure HNP 3702 already requires that a pump flow rate and an output pressure reading be made to satisfy Tech Specs section 4.1.5.c.2. The subject procedure was revised such that the pump discharge valve is throttled to obtain a reference output pressure (greater than or equal to the 1190 psig pressure r,equired by Tech Specs), and then flow measurement is taken and compared to the reference flow rate.

As the SBLC pumps are positive displacement and are designed to pump a specified flow rate at "any" output pressure, it was decided that taking differential pressure readings was not a true indicator of pump performance.

Therefore, we shall continue to check flow rate in lieu of delta P as allowed by ASME code.

If you have any questions or comments in this regard, please contact my office.

Sincerely yours, x exL JAE/mb W. A. Widner f[4 t f 06110 ;h

Georgia Pbwerd Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission l June 4, 1980 .

j Page Two '

xc
Ruble A. Thomas George F. Trowbridge, Esquire

, R. F. Rogers, III i J. T. Beckham, Jr. '

i M. Manry i L. T. Gucwa

! J. R. Jordan

! C. V. Syx M. Belford R. A. Glasby C. L. Coggin i T. L. Elton -

1 i

i t

4 1

i s

1 t

k'

, ,