ML20069A460
| ML20069A460 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/13/1994 |
| From: | Hunger G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-10, NUDOCS 9405250208 | |
| Download: ML20069A460 (4) | |
Text
St:tiin Suppirt Esp;rtm:nt a
'T PECO ENERGY
.d., J=r=;L 905 Chesterbrook Boulevard Wayne, PA 19087 5691 May 13,1994 Docket Nos. 50-277 50-278 Ucense Nos. DPR-44 DPR-56 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555
SUBJECT:
Review of Response to Request for Additional Information on Generic Letter 89-10, Supplement 3, " Consideration of NRC Sponsored Tests of Motor Operated Valves"
REFERENCES:
1)
Letter from J. W. Shea (NRC) to G. J. Beck (PECO Energy Company) dated February 25,1992 2)
Letter from G. J. Beck to NRC dated August 5,1991 3)
Letter from G. J. Beck to NRC dated October 4,1991
Dear Sir:
The Reference 1 letter transmitted the NRC review of the PECO Energy Company (PECO Energy) responses (References 2 and 3) to an NRC request for additional information concerning Generic Letter (GL) 89-10, Supplement 3, for Peach Bottom Atomic Power Station (PBAPS). In Reference 1, the NRC provided additional comments along with a request to be notified upon completion of selected action items. Restated below are the additional NRC comments / action items followed by the PECO Energy response.
NRC Comment 1) Based on the information provided, the staff considers the Unit 3 High Pressure Coolant injection (HPCI) Motor-Operated Valve MOV 23-15 to 'oe marginal with respect to i
its capability to perform its design function to isolate containment in the event of a pipe break downstream of the valve. The licensee should develop a plan and schedule to address this MOV on a priority basis within its GL 89-10 program. Please inform the staff when the plan and gIJL.Lt; schedule for this valve are available for staff review.
i}{[ b-f O
940525020e 94ost3 DR' ADoCK 05o00277 PDR
.J'
' May 13,1994 Page 2 PECO Energy PcCO Energy has addressed the Unit 3 HPCI MOV 23-15
Response
valve in our Generic Letter 89-10 program.' This valve has been set up to the criteria of our program including the use of a.4 valve factor, an engineered safety factor of 15% and allowances for inaccuracies of testing equipment and torque switch repeatability. The valve was last adjusted and statically tested on September 28,1993. The measured thrust at torque switch trip was 26,810 lbs., which exceeds the required thrust of 26,714 lbs. Our programmatic approach for this valve was reviewed by the NRC during the October 1992, Generic Letter 89-10, " Safety-Related Motor Operated Valve Testing and Surveillance," inspection at PBAPS.
NRC Comment 2) The licensee indicated that Unit 3 Reactor Core isolation Cooling (RCIC) MOV 13-16 and Reactor Water Cleanup (RWCU) MOV 12-18 had their torque switches set low, but that the settings were to be increased during the Fall 1991, Unit 3 refueling and maintenance outage. Please inform the staff if these adjustments were made.
PECO Energy Adjustments to the Unit 3 RCIC MOV 13-16 and RWCU
Response
MOV 12-18 were made during the Fall 1991, refueling outage.
MOV 13-16 was most recently tested on October 24,1993.
The measured thrust at torque switch trip was 5,889 lbs.,
which exceeds the required thrust of 5,644 lbs. At this new setting this valve was set up to the criteria of our GL 89-10 program including the use of a.4 valve factor, an engineered safety factor of 15% and allowances for inaccuracles of testing equipment and torque switch repeatability.
MOV 12-18 was most recently tested on October 24,1993.
The measured thrust at torque switch trip'was 22,912 lbs.,
which exceeds the required thrust of 21,945 lbs. At this new setting this valve has been set up to the criteria of our GL 89-10 program including the use of a.5 valve factor, an -
engineered safety factor of 15% and allowances for inaccuracies of testing equipment and torque switch repeatability.
NRC Comment 3) In addition, the staff found that the Unit 2 HPCI MOV 23-15 and RWCU MOVs 12-15 and 12-18 have their torque switch settings set above the applicable actuator ratings. The licensee should perform an evaluation of these actuator
MP.y 13,1994 me3 v
ratings and consider any necessary limitations cq the number of allowable operating cycles for each r.ctuator.
Please inform the staff when this evaluation is complete.
PECO Energy in Reference 1 we identified that HPCI MOV 23-15, RWCU
Response
MOVs 12-15 and MOV 12-18 were operating at thrusts exceeding the actuator's thrust rating.
HPCI MOV 23-15 has been set up to the criteria of our GL 89-10 program including the use of a.4 valve factor, an engineered safety factor of 15% and allowances for inaccuracies of testing equipment and torque switch repeatability. The valve was last adjusted and statically tested on October 25,1992. The valve is currently set with a torque switch setting of 1.50. Test data indicates a thrust at torque switch trip of 31,862 lbs. and a total thrust of 36,742 lbs., which exceeds the maximum allowable. The use of this actuator at this total thrust has been justified for reduced cycles of operation in accordance with Limitorque approved guidelines.
RWCU MOV !2-15 has been set up to the critoria of our GL 89-10 program including the use of a.4 valve factor, an engineered safety factor of 15% and allowances for inaccuracies of testing equipment and torque switch repeatability. Tha valve was last adjusted and statically tested on November 8,1992. The valve is currently set with a torque sctting of 2.50. Test data indicates a thrust at torque switch trip of 18,484 lbs. and a total thrust of 20,446 lbs., which is loss than the maximum allowable thrust.
Operation at previous higher maximum thrust levels was justified based en limited cycles of operation at those conditions in accordance with Umitorque approved guidelines.-
RWCU MOV 12-18 has been set up to the criteria of our GL' 89-10 program including the use of a.4 valve factor,'an engineered safety factor of 11% and allowances for inaccuracies of testing equipment and torque switch repeatability. The valve was last adjusted and statically tested on November 7,1992. The valve is currently set with a torque switch setting of 2.75. Test data indicates a thrust at torque switch trip of 17,728 lbs. and a total thrust of 23,154 lbs., which exceeds the maximum allowable thrust.
The use of this actuator at this total thrust has been justified -
for reduced cycles of operation in accordance with Umitorque approved guidelines.
' May 13,1994 Page 4 If you have any questions concerning this response or require additions information, please contact us.
Sincerely, f*
G. A. Hunger, Jr., Director Ucensing cc:
T. T. Martin, Administrator, USNRC, Region I W. L. Schmidt, Senior Resident inspector, USNRC, PBAPS