ML20154J268
| ML20154J268 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 05/17/1988 |
| From: | Hunsader S COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8805260247 | |
| Download: ML20154J268 (4) | |
Text
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I'N Commonwealth Edloon (O ) One Fr:1 National Plaza, Chicago, Minois g
] Address ReW to: Post Offca Box 767
(,/ Chicago,;&nois 60690 0767 May 17, 1980 Mr. T. E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC.
20555 Attn: Document Control Desk
Subject:
Braidwood Unit 1 and 2 Limitorque Operator Lubrication NRC Docket Nos. 50-456 and 50-457
Reference:
(a) April 11, 1988 L.O. De1 George letter to T.E. Murley
Dear Mr. Murley:
The purpose of this letter is to clarify and provide correction to information documented in reference (a). Attachment 1 to reference (a) provided the "Lubrication Containination Evaluation". On page 10 of, the mixtures of virgin grease were listed that would be penetration tested to provide additional insight on the potential affects of mixing Nebula EPO and EPl with Sun 50 EP.
Tables 1-3a and 1-3b of provided the results of this testing and showed that only minor changes existed in penetration resistance as a function of mix ratio.
1 Upon performing a reverification in this area, because the penetration results were lower than expected, Commonwealth Edison has identified that the grease mixed with the Nebula EPO and EPl was Sun 742 EP and not the Sun 50 EP as indicated. As such, the penetration test results are representative of mixtures including Sun 742 EP.
An evaluation was made as to the significance of this deviation and the results were reported to the NRC staff on May 10, 1988 via a teleconference.
The 742 EP and 50 EP are both lithium based greases. However, the soap types, EP agent and N14I grades are different so a correlation between 742 Ep and 50 EP penetration results can not be reasonably made. Therefore, new samples of grease mixtures, made up of Nebula EPO and EP1, and Sun EP 50, have been mixed and penetration tested per ASTM D1403.
Qh y
8805260247 880517 I
DR ADOCK 05000456 DCD
Q The results of the new grease mixture testing are provided in the attached updated Tables 1-3a and 1-3b for the EPO and EP1, respectively.
The penetration results are representative of that which would be expected for EPO and EP1 mixed with Sun 50 EP.
The Sun 50 EP was obtained from spare limitorque operators in storage at Braidwood, that are of the same vintage and have the same grease as the installed Braidwood operators.
In addition, some grease from stores which was verified to be Sun 50 EP wcs added to obtain the quantities necessary for testing.
Please address any questions concerning this matter to this office.
Very truly yours, i
A S. C. Hunsader
/
Nuclear Licensing Administrator
/klj att.
cc:
S. Sands (NRR)
W. Forney (RIII)
Braidwood Resident Inspector 4589K 1
e
_ g.
Table 1-3a Nebula CP0/ Sun 50 EP Penetration Resistance MIXTURE Constituents Test (
100% EPO / 0% Sun 377 98% EPO / 2% Sun 384 95% EPO / 5% Sun 384 75% EPO / 25% Sun 354 50% EPO / 50% Sun 314 25% EPO / 15% Sun 292 5% EPO / 95% Sun 298 2% EPO / 98% Sun 298 0% EPO / 100% Sun 309
.(1)
Note test repeatability is in the range of i three pointo (2)
Based on penetration test (ASTM D1403)
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Table 1-3b Nebula EPl/ Sun-50 EP Penetration Resistance MIXT"RE Constituents Test 100% EPl / 0% Sun 313 98% EP1 / 2% Sun 317
-95% EP1 / 5% Sun 317 75% EPl / 25% Sun 496 50% EP1 / 50% Sun 310 25% EP1 / 75% Sun 299 5% EP1 / 95% Sun 305 y
2% EP1 / 98% Sun 305 0% EPl / 100% Sun 309 (1)
Note test repeatability is in the range of 1 three points (2)
Based on penetration test (ASTM D1403) 4589K-E ------- _-_ _--- - ---------------- ------ -- -
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