ML19322A285
| ML19322A285 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/23/1979 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| GOL-0394, GOL-394, NUDOCS 7903290150 | |
| Download: ML19322A285 (1) | |
Text
r Metropolitan Ed: son Company F
e Post Office Box 542 Reading Pennsylvania 19640 215 929 3601 921 6510 Writer's Direct Deal Numter March 23, 1979 GQL 039h Dir^ctor of Nuclear Reactor Regulations Attn: R. W. Reid, Chief Operating Reactors Branch No. h U. S. Nuclear Regulatory Commission Washington, D. C 20555
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating Licence No. DPR-50 Docket No. 50-289 Power Imbalance Detector Correlation (PIDC) Test This letter, being submitted for your information, documents the March 16, 1979 discussion between NRC's Mr. J. E. Rosenthal and Mr. D. C. D1Ianni and Met-Ed 's Mr. W. S. Wilkerson, Mr. H. C. Crawford and Mr. R. J. Stevens, concerning the Incore vs Excore Detector Imbalance Correlation Verification to be conducted during the TMI-l Cycle 5 startup and physics testing.
Section 9.3.2 of the TMI-l Cycle 5 Reload Report, submitted on December 28,1978 (GQL 2068) in support of Technical Specification Change Request No. 86, indicates that the excore detector offset vs incore detector offset slope criterion may be reduced from 1.25 to 1.15 if the imbalance correlation verification in repeated at 75% FP.
By letter dated March 15, 1979 (REM-I-383), Babcock & Wilcox recommended revisions to the " Power Escalation Test for TMI-l Cycle 5",
based on analysis of recent PIDC test data.
Specifically, B&W recommended performing the PIDC test at 40% FP only, dcl? ting the test at 75% FP, and establishing a minimum excore va incore offset slope of 1.15 at h0% FP.
Therefore, Met-Ed intends to perform the PIDC test at 40% FP only.
However, if the difference between incore and excore measurements exceeds the differences observed during past cycles, Met-Ed will t-ke appropriate corrective measures.
" neerel',
N J. G. Herbein 79o 9041%
Vice President Generation JGH:RJS:mrm g
Metropohtan Edison Company is a Memtor of the General Pubir: Utd. tion Syctem