ML18059B048
| ML18059B048 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 06/03/1994 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML18059B047 | List: |
| References | |
| EM-09-13, EM-9-13, NUDOCS 9406130139 | |
| Download: ML18059B048 (1) | |
Text
RELIEF REQUEST BASIS NUMBER 1 Proc No EM-09-13 Attachment 4 Revision 1 Page 1 of 1 SYSTEM: Primary Coolant System (PCS)
SUBJECT:
Use of PI-0104 in lieu of digital pressure instrument meeting requirements of Code Case N-437. CLASS: 1 -FUNCTION:
PI-0104 is used to monitor test pressure during the Primary Coolant System hydrostatic test.
- TEST REQUIREMENT:
Nuclear Code Case N-437 requires for digital pressure measuring instruments that "the intended maximum test pressure does not
- exceed 70% of the calibrated range of the_ instrument.
Accuracy shall be within 0.5% of calibrated range." BASIS FOR RELIEF: ALTERNATIVE:
Specification and installation of a test pressure instrument of proper range in order to meet Code requirements would not obtain information more useful than presently available using Installed Plant Instruments.
PI-0104 has a full scale range of Oto 3000 psia. PCS hydrostatic test pressure is 2101 psia with a maximum allowable pressure of 2125 allowed for control purposes.
2125 psia is equivalent to 71% of the maximum PI-0104 range. This exceeds the 70% limit allowed by Nuclear Code Case N-437. However. a difference of 1% will not make a significant difference in the. quality of test pressure data..
- Palisades will perform PCS hydrostatic testing using PI-0104 as the test pressure instrument.
Accuracy requirements for this gage shall meet the 0.5% requirement of Nuclear Code Case N-437. However. the maximum expected PCS hydrostatic test pressure . (2125 psia) will of the maximum gauge range C0-3000
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