ML20078H512
| ML20078H512 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 10/05/1983 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8310140197 | |
| Download: ML20078H512 (16) | |
Text
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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BClX 8699 PHILADELPHIA. PA.19101 JOHN S. MEMPER VIC E-PR ESID E NT test.enar nesee asso nata anc M Mr. Darrell G. Eisenhut, Director Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Limerick Generating Station, Units 1 & 2 Dockets No. 50-352 and 50-353
References:
1)
Letter V. S. Boyer to R. L. Beer, dated March 26, 1979 2)
Letter J. S. Kemper to D. G. Eisenhut, dated November 4, 1981
Dear Mr. Eisenhut:
In a meeting with the NRC Materials Engineering Branch on August 31, 1983, it was requested that the reference 2) letter be revised and expanded in the following areas:
a)
Decision Basis for Pipe Replacement The Limerick construction schedule permitted PECo to reconsider the use of 304 stainless steel piping in light of the many cracks that had been discovered in operating plants.
In an effort to minimize our susceptibility within schedule constraints, PECo justified continued use of "non-conforming" materials based upon 1) the ability to isolate a line with non-conforming material from the RPV and 2) normal service temperatures of less than 200*F, the temperature which was generally considered to be the threshold of IGSCC.
b)
Material Corrections and Additions 1)
With the exception of the Reactor Water Clean-up flued head which is 316L, the flued head material for the systems listed in reference 2) is SA-182 F316 and not type 304 as previously stated.
2)
The Core Spray loops have a stainless steel type 304 transition piece between the carbon steel and flued head.
- 8A M 8 W J 8588h kO A
PDR s
3)
Not.shown on the Reactor Water Cleanup System sketch in the reference 2) letter is a 4" suction line from the reactor pressure vessel drain. This line is 304L stainless steel with the exception of one 6",
316 stainless steel valve, IF100, which was heat sink welded into the line and one 2", 316 stainle.a steel bypass valve, 1F050, which was welded in a normal manner.
c)
Materials of Systems Outside Primary Containment t
1)
Contrary to the statement in the Limerick SER, Section 5.2.3, pg. 5-6, the RHR, LPCI, and Core Spray Systems are carbon steel beyond the outer isolation valve. We wish to bring this to your attention.
Please contact us if you wish to discuss this matter.
2)
RWCU is as shown in reference 2).
d)
Inspectability of Welds in Nonconforming Portions of Systems Welds in the nonconforming portions of Class I systems, including flued head to valve welds, are being inspected using both ultrasonic and liquid penetrant techniques as required by ASME Section XI.
e)
Approximate Number of Welds per unit in Nonconforming Portions of Systems 1)
Inside Containment a)
Core Spray - There are 4 nonconforming welds in this system, 2 in each loop. These are adjacent to the inside end of the flued head. They are isolable and will be operating at temperatures below 200*F.
b)
RHR - There are 58 nonconforming welds in this system; they are all isolable and operate at below 200*F with two exceptions (four welds):
- 1) welds to the RHR shutdown cooling suction valve, 1F009, and 2) welds to the head spray line valve, 1F022. We are currently evaluating appropriate IGSCC mitigation weasures for 1F009 and 1F022.
c)
RWCU - There are 2 nonconforming welds in this system. They are welds to a 2", 316, bypass valve 1F050, in the RPV drain line, these are noted above in paragraph b) 3).
We are currently evaluating appropriate IGSCC mitigation measures for IF050.
i
. 2)
Outside Containment Most of the nonconforming welds outside of containment are on the Reactor Water Clean-up System. There are approximately 500 of these welds on Unit 1, many are below 200*F.
On Unit 2, RWCU material with service temperatures greater than 200*F were replaced with conforming material. The remainder of the nonconforming welds outside of containment are the welds between the 316 stainless steel flued heads and the outer isolation valves, these are all below 200*F.
f)
Sketches As requested we are providing isometric sketches for the Core Spray, RHR, LPCI, and RWCU systems to more clearly define our compliance with NUREG-0313. A sketch of the recirculation system is not included since it was noted in the two referenced letters that the piping in this system was completely replaced with conforming material.
If you have any questions or comments, please do not hesitate to contact us.
Sincerely, o
cc: Judge Lawrence Brenner (w/o enclosure)
Judge Richard F. Cole (w/o enclosure)
Judge Peter A. Morris (w/o enclosure)
Troy B. Conner, Jr., Esq.
(w/o enclosure)
Ann P. Hodadon, Esq.
(w/o enclosure)
Mr. Frank R. Romano (w/o enclosure)
Mr. Robert L. Anthony (w/o enclosure)
Mr. Marvin I. Lewis (w/o enclosure)
Judith A. Dorsey, Esq.
(w/o enclosure)
Charles W. Elliott, Esq.
(w/o enclosure)
Jacqueline I. Ruttenberg (w/o enclosure)
Thomas Y. Au, Esq.
(w/o enclosure)
Mr. Thomas Gerusky (w/o enclosure)
Director, Pennsylvania Emergency Management Agency (w/o enclosure)
Mr. Steven P. Hershey (w/o enclosure)
Angus Love, Esq.
(w/o enclosure)
Mr. Joseph H. White, III (w/o enclosure)
David Warsan, Esq.
(w/o enclosure)
Robert J. Sugarman, Esq.
(w/o enclosure)
Martha W. Bush, Esq.
(w/o enclosure)
Spence W. Perry, Esq.
(w/o enclosure)
Atomic Safety and Licensing Appeal Board (w/o enclosure)
Atomic Safety and Licensing Board Panel (w/o enclosure)
Docket and Service Section (w/o enclosure (w/o enclosure))
Jay M. Gutierrez, Esq.
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