ML20039C291
| ML20039C291 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/22/1981 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8112290184 | |
| Download: ML20039C291 (2) | |
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D PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET
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P.O. BOX 8699
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,y 1881 -1981 PHILADELPHI A. PA.19101 N4
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(215)841 4502
?c J,,*,(77 December 22, 1981
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Docket Nos. 50-352 50-353 Mr. Ibbert L. Tedesco Asst. Director for Licensing Division of Licensi:r!
U.S. Nuclear Pegulatory Otrmission Washington, DC 20555
Subject:
Limerick Generating Station Fesolution of Channel Box Deflection Issue for Near-Term BWR OLs
Dear Mr. 'Ibdesco:
Your letter of October 26, 1981 to E. G. Bauer transmitted Section 4.2.3.5 of A endment No. 76 to the Zimer FSAR, which proposes several steps that could be taken to mitigate the consequences of channel bowing, and requested Philadelphia Electric Ocrpany's ccraaitment to a similar plan for Limerick Generating Station.
Philadelphia Electric Ccrpany proposes the following channel residence guidelines and testing procedures to mitigate potential fuel channel bowing and its effects.
Channel Residence Guidelines i
1.
Pecords will be kept of channel location and exposure for each cycle.*
2.
When possible, channels will not reside in the outer row'df the i
core for more than two operating cycles.
3.
Channels that reside in the outer row for more than one cycle will be positioned in core locations that permit different channel sides to face the core edge on successive cycles.
4.
Channels that reside in the outer row of the core for three or
{s@I rore cycles will not be shuffled inward.
5.
At the beginning of each cycle, the ccrbined (sum of) outer row residence times for any two channels in any control rod cell will
/ ly rot exceed four peripheral cycles.
'Ihe term " cycle", as used in the following recomendations, is defined to be a ncminal fuel cycle (12-18 nonths).
8112290184 811222 PDR ADOCK 05000352 A
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Testing Procedures Prior to beginning a new operating cycle, control rod motion testing will be performed for all core cells and therefore, for those cells that might be exceeding the above guidelines.
Pod notion testing currently perforned by trany operating EhB's as part of their Technical Specifications and Reload Startup Test Programs will adequately denenstrate the scrantrability of the reactor.
The Standard Technical Specifications regture that each control rod be noved at least one notch every 7 days. Technical Specifications also require periodic scram testing.
In addition, Limerick Generating Station will perfonn a control rod notion test similar to that used by operating Bh3's as part of Reload Startup Testing. 'Ihis test will confirm that each control rod can nove full stroke under normal control rod drive (CRD) operating pressures.
The tests discussed above daenstrate the nobility of the control rods at normal CRD operating pressure. The forces on the control blade daring scram are orders of r'agnitude higher than those at nonnal operation.
'Iherefore, control rods that are novable at nonral CRD pressure will not prevent the scram function.
These tests will dmonstrate that channel interference, if any, is not significant enough to effect the safety of the plant.
Should you require any naditional infonration, please contact us.
Sincerely,