ML19329E512
| ML19329E512 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/29/1976 |
| From: | Bauman R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| References | |
| 2247, NUDOCS 8006160310 | |
| Download: ML19329E512 (3) | |
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C20030'f General Offices: 212 West Micnigan Avenue, Jackson, Michigan 49201. Area Coce S17 788-05S0 March 29, 1976 5
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Director of Nuclear Reactor Regulation Yg*gh Attn:
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ANALYSIS CRITERIA FILE: B3.6 SERIAL: 2247 Performance of the Midland High Energy Line Break Analysis (HELBA), since the submittal of PSAR Amendment 25, has raised many questions on interpretation of NRC criteria for the analysis. We feel that these questions can best be addressed by a meeting with the appropriate NRC staff personnel. A proposed agenda outlining the topics of discussion has been attached for your considera-tion.
Due to the impact upon the Midland High Energy Line Break Analysis, we vould appreciate an opportunity to meet with your staff as soon as possible.
R. C. Bau=an Project Engineer RCB/fw 3417 0006160 37o
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p PROPOSED HIGH ENERGY LINE BREAK ANALYSIS MEETING AGENDA I.
Interpretation of piping runs, branch runs, and terminal end points We propose that piping runs and branch runs for piping inside and outside containment be treated as a total piping system between fixed points (anchors) since the stress analysis performed considers it as such. We perform thermal, dead weight, and seismic stress analyses for the total system including branch lines (within anchors).
The analysis considers all cf the stress intensification factors and flexibility factors as applicable to various piping components.
Thus, we propose that breaks be postulated within the system as follows:
1.
Terminal and points (anchors)
(Branch connections to main piping are not considered as terminal ends.)
2.
At all points which exceed the stress criteria of R.G. 1.46 (As a minimum, two (2) intermediate breaks will be selected for each piping system,0nain and branch lines within anchors 3)
II.
Longitudinal slot breaks at terminal end points We propose that longitudinal slot breaks not be postulated to occur at terminal end points for piping without longitudinal welds. This j
proposal is in accordance with Section 3b(2)(a) of the Branch Technical Position MEB 3-1 and should be a reasonable assumption for Midland Units 1 and 2 both inside and outside of containment.
III.
Longitudinal slot breaks at intermediate locations We propose that longitudinal slot breaks not be postulated to occur at intermediate locations where the Regulatory Guide 1.46 criterion for a minimum number of break locations must be satisfied. This proposal is in accordance with section 3b(2)(b) of the Branch Technical Position MEB 3-1 and should be a reasonable assumption for Midland Units 1 and 2 both inside and outside containment.
IV.
Discussion of item 3 of A. Schwencer (NRC) to S. Howell (CPCo) letter of October 18, 1974, pertaining to Amendment 25 to the Midland PSAR.
V.
Moderate Energy Analysis Based on agreements reached in the meeting with the NRC on September 11, 1973, it is our understanding that moderate energy analysis is not required for Midland.
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NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL
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R.S. Boyd FROM: Consumers Power Co.
^TE OP oOCuuENT 3-29-76 Jackson, Michigan R.C. Bauman oATE aECglVEO 4
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DESCRIPTION ENCLOSU RE Ltr. trans the following.......
High Emergency Line Breaker Analysis Criteria W/ Attached Meeting Agenda.....
(1 Cy. Received)
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PLANI NAME:
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