ML20084T548
| ML20084T548 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 10/05/1972 |
| From: | Worden W COMMONWEALTH EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20084T542 | List: |
| References | |
| NUDOCS 8306230258 | |
| Download: ML20084T548 (1) | |
Text
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444 A EST OCT 6 72 DEA 544 DE kg g
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SUBJECT DPR2$ DRESDEN NUCLEAR POWER STATION UNIT 3.
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-e THIS VILL CONFIRM A CONVERSATION WITH MR H. DANCE OF YOUR h
kh 0FFICE AT 1400 HOURS THIS DATE CONCERNING ECCS 350 PSI 3{
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LOW REACTOR PRES 3URE SWITCHES BEING OUT OF CALIBRATION SHOWE e3o f
THAT TWO OF THE FOUR SVITCHES HAD TRIPPED SETTING GREATER TH o
THE LIMIT IN TABLE 3.2 2. OF TECHNICAL SPECIFICATIONS.
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) TABLE 3n2 2. STATE THE TRIP SETTING SHOULD BE GREATER THAN O
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"3 330 PSIG AND LESS THAN 350 PSIC PRESSURE SWITCH 3-263-5 2A2
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TRIP SETTING WAS FOUND TO BE 371 PSIC. PRESSURE SVITCH iE 65 4
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C-33-263-52B2 TRIP SETTING WAS TOUND TO BE 354 PSIC.
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PRIOR TO THIS CALIBRATION THE *AS LEFT" SETTING ON THESE h
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SL' ITCHES VAS 355 PLUS OR MINUS 5 PSIC. OUR LIMIT FOR THESE
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SWITCHE3 HAS NOW'BEEN CHANGED TO 325 PLUS OR MINUS 10 PSIG.
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THIS SETTING IS IN THE CENTER OF TECHNICAL SPECIFICATIONS PRESSURE RANGE AND ALLOWS GREATER MARGIN FOR INSTRUMENT DRIFT WALTER P. WORDEN, SUPT.
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