ML20049J447
| ML20049J447 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/16/1982 |
| From: | Schroeder C COMMONWEALTH EDISON CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| 3643N, NUDOCS 8203180217 | |
| Download: ML20049J447 (7) | |
Text
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[D Commonwealth Edison
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) ont First Nation:1 P!Tza. Chicigo, liknojs i
C ' Addr:ss R: ply to: Post Offica Box 767
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Chicago, Illinois 60690 March 16, 1982 gp G
RECEIVED
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Mr. A. Schwencer, Chief R1 71982m-i Licensing Branch #2 8gammemma, Division of Licensing L
gymmu U. S. Nuclear Regulatory Commission E
Washington, DC 20555 0) tn
Subject:
LaSalle County Station Units 1 & 2 Diesel Generator Piping Convention NRC Docket Nos. 50-373 and 50-374 Reference (a):
C.
W.
Schroeder letter to A. Schwencer dated March 3, 1982, same subject.
Dear Mr. Schwencer:
The purpose of this letter is to provide the results of a design review of piping on the LaSalle County Station diesel generators.
This report differs from Reference (a) only in that the information for the 26 diesel generator is included in this report.
In a January telecon with A. Bournia ano John Knox, et al o f the NRC, Edison was requested to review the piping on the LSCS diesel generators to comply with a newly imposed convention on the piping interface between the plant and a diesel generator.
That interface is the first joint / flange / screwed connection on the pipe outward from the diesel engine block.
The Commission staf f wanted to be assured that a design review was completed for the diesel generator piping located between the former interface point (on-skid connection) and this new interf ace point.
Fu r the r, they wanted to be assured that design margin was identified for piping under this new definition and that engineering standards were met.
The results o f this design review o f the as-built conditions at the station for HPCS diesels and the three emergency power diesels follows:
Air Start Piping - AE review o f the as-built conditions shows that the air start piping furnished as a part o f the diesel engines meets the intent o f ANSI B31.1 Power Piping Code.
Field measurements show that actual pipe thickness is 1.8 to 2.0 times the minimum required thickness per ANSI B31.1.
These thicknesses translate directly to stress margins of the same magnitude.
Pressure ratings on flexible air hoses exceed these margins.
8203180217 820316 pp[
PDR ADOCK 050003{
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A. Schwencer March 16, 1982 Fuel Oil Piping - The fuel oil piping furnished as an integral part of the diesel generators conforms to the requirements of National Fire Protection Association Standards NFPA 30 and 37.
NFPA 30 requries that fuel oil piping meet ANSI B31.1 Code requirements; therefore, at LaSalle the diesel generator fuel oil piping meets the 831.1 standards.
Actual field measurements of piping wall thickness reveals 1.86 to 2.11 times the minimum thickness required by ANSI B31.1.
These thicknesses translate directly to stress margins of the same magnitude.
Lube Oil Piping - The lube oil piping also conforms to the require-ment of NFPA 30 and 37 and, as such, should also meet. the intent of ANSI B31.1 code requirements.
Field measurements indicate that acutal piping thickness is 1.83 to 2.05 times the minimum thickness required by ANSI B31.1.
Stress margins o f the same magnitude translate from these thickness margins.
Cooling Water Piping - The cooling water piping from the temperature regulator to the heat exchanger for each diesel engine conforms to ASME.Section III Class 3 (1974) requirements.
All other piping furnished as an integral part of the diesel engine equipment meets the intent o f ANSI B31.1.
Field measurements of actual piping thickness indicates 1.80 to 2.05 times the minimum thickness required by ANSI B31.1.
These thicknesses translate directly to stress margins of the same magnitude.
Plant piping to the original interface point meets the ASME III Code.
The entries in FSAR Table 3.21 relating to the above piping are still correct af ter definition of the newly defined interf ace point.
The piping supports also received a design review during the SQRT program for plant-connecting piping and for skid mounted and engine mounted piping.
An acceptance report is part of the SQRT record file on this equipment.
One (1) copy of sketches with connection piping to the diesel engines, as provided from the vendor, is furnished to show the location of the first joint / flange / screwed connection off the engine block.
LaSalle diesels 0, lA, 18, 2A and 2b are depicted.
If there are any further questions concerning this matter, please contact this office.
Very truly yours, OJJh d@-
C.
W.
Schroeder Nuclear Licensing Administrator 1m Enclosure cc:
NRC Resident Inspector - LSCS 3643N
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