ML18064A466
| ML18064A466 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 11/03/1994 |
| From: | Kennedy J Office of Nuclear Reactor Regulation |
| To: | Hannon J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9411160148 | |
| Download: ML18064A466 (2) | |
Text
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l NOTE TO:
John N. Hannon, Director Project Directorate 111-1 FROM:. -
Janet L. Kennedy ff\\~ :
Project Manager
\\f-f Project Directorate 111-1 November 3, 1994
SUBJECT:
RECORD OF TELEPHONE CONVERSATIONS, PALISADES REACTOR PRESSURE VESSEL In SECY-94-267, "Status of Reactor Pressure Vessel Issues," the staff indic~ted that the Palisades reactor pressure vessel would reach the PTS screening criteria in the year 2004.
In addition, we indicated that the licensee was performing tests on weld material from its retired steam generators to gather additional information for the lim'iting weld metals in its reactor pressure vessel. The purpose of this note is to provide the preliminary test results received by the licensee from its contractor.
The licensee provided the preliminary.. test results in telephone conversations on November 1 and 2~ 1994.
The material property identified in the PTS rule that determines whether a vessel is below or above the PTS screening criteria is the RTPrs value. The RTPrs value is the sum of the unirradiated reference temperature, the increase in reference temperature resulting from neutron irradiation and margin to account fqr uncertainty in the unirradiated and irradiated properties. The increase in reference temperature is dependent upon the amounts of copper and nickel in the weld and the neutron fluence.. The amount of margin depends upon
.. whether the unirradiated reference temperature is a generic value or a heat specific value and whether the increase in reference temperature was detennined from surveillance data or from the chemistry data tables in the PTS rule. The previous RTPTs value for the limiting weld in Palisades was the sum of a generic unirradiated reference temperature, ~s6°F; margin, 66°F; and an increase in reference temperature that was based on a best estimate chemical composition of 0.20% copper and 1.02% nickel and an end of license fluence of
- 1. 91El9 n/cm2
- The tests on the retired steam generators, being performed by Harwell (U.K.),
will provide additional information to determine a heat specific value of unirradiated reference temperature and a revised best estimate chemical composition.
Based on the preliminary test results, the best estimate chemical composition for the limiting weld is 0.237% copper and 1.03% nickel.
The licensee indicated that the Palisades reactor pressure vessel will reach the PTS screening criteria in 210 effective full power days (May 29, 1995) if its RTPrs value is calculated using a chemical composition of 0.237% copper and 1.03% nickel, the licensee's current estimate of neutron fluence, the generic unirradiated reference temperature of -56°F, and a margin of 66°F.
However, the Palisades reactor vessel will reach the PTS screening criteria in 1998 if its Rlprs value is calculated using a heat specific unirradiated reference temperature of -56°F and a margin of 56°F.
The lower value of margin is used because the unirradiated reference temperature is a heat specific value.
The results from the tests to determine the unirradiated reference temperature will be available by November 11, 1994.
Westinghouse is,owvo</
NIRC fnlE CttrulfttR COPY 11fol ' 0 Docket No. 50-255
~11160148 941103 ' ;j i
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- November 3, 1994 reviewing the licensee's current estimate of neutron fluence.
This review is scheduled to be completed by November 28, 1994.
The licensee plans to take additional measurements for further analysis.
In addition, the original samples will be sent to Combustion Engineering for independent analysis. Although Harwell has previously calibrated its equipment prior to performing the chemical analysis tests, they will also verify their test equipment against a known *standard to ensure the test equipment is accurate.
The licensee plans to submit an engineering evaluation to the staff within the next week which will document the test data discussed above.
Currently, a meeting is planned at Headquarters on November 18, 1994, to discuss the final test results and the licensee's plans for continued operation.
cc:
B. Sheron KWichman G. Lainas R-limme~~man J. Strosnider WRussell B. Elliot JRoe M. Gamberoni
- SEE PREVIOUS CONCURRENCE OFFICE PM: PD D:PD*
EMCB fb NAME JKenne y er JHannon BEl l i ot KWichman DATE I/ D3 94 11 03 94 9 94 I/ I, /94 I
OFFICIAL RECORD COPY FILENAME: G:\\WPDOCS\\PALISADE\\PALTELE.PTS Docket No. 50-255 DISTRIBUTION:
,~-Docket -F; le- (50-255)
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