ML18081B144
| ML18081B144 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 02/29/1980 |
| From: | Eckert R Public Service Enterprise Group |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| IEIN-79-37, NUDOCS 8003050470 | |
| Download: ML18081B144 (4) | |
Text
Richard M. Eckert Senior Vice President Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/430-8096 Energy Supply and Engineering February 29, 1980 Mr. Darrell G. Eisenhut,' Acting Director Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Gentlemen:
CRACKING IN LOW PRESSURE TURBINE DISCS SALEM GENERATING STATION UNIT NO. 1 DOCKET NO. 50-272 In compliance with your letter of February 25, 1980, with respect to Information Notice No. 79-37, we are submitting the following response to Enclosure 2:
REQUEST FOR INFORMATION RELATED TO TURBINE DISCS Site Specific General Questions I.
A.
Turbine Type -
This unit consists of one Westinghouse tandem compound, six flow, four casing, condensing, 1800 RPM turbine utilizing 44-inch last row blades in each low pressure element.
The low pressure element is designated as a building block 81.
B.
Number of hours of operation for each LP turbine postulated to turbine inspection -
17,624 hours0.00722 days <br />0.173 hours <br />0.00103 weeks <br />2.37432e-4 months <br />.
- c.
Number of turbine trips and overspeeds -
61 trips 4 overspeeds D.
This information is being requested of Westinghouse and will be forwarded when it is available.
Aool s,,,
! ~.
2 -
2-29-80 II.
Provide details of the results of any completed inservice inspection of LP turbine rotors, including areas examined since issuance of an operating license.
For each indication detected, provide details of the location of the crack, its orientation, and size.
No inspection for disc bore cracking has been performed.
Discs have been magnetic particle inspected at every turbine inspection and no cracks have been detected.
III. Provide the nominal water chemistry conditions for each LP turbine and describe any condenser inleakages or other significant changes in secondary water chemistry to this point in its operating life.
Discuss the occurrence of cracks in any given turbine as related to history of secondary water chemistry in the unit.
Water chemistry has been within Westinghouse prescribed limits.
The major portion of the condenser leaks that' occurred between July and December 1978 did not adversely effect the carryover levels in the steam.
Retubing of the condenser and installation of a full low condensate polishing system have further enhanced the water quality in the secondary cycle.
Additional information is being developed and will be supplied within twenty days.
IV.
If your plant has not been inspected, describe your proposed schedule and approach to ensure that turbine cracking does not exist in your turbine.
Since this is a Category "A" unit, Westinghouse recommends inspection as the service period approaches five years.
However, we have scheduled the inspection for the next refueling outage in the fall of 1980 which is less than four years from the unit's initial operation.
- v.
If your plant has been inspected and plans to return or has returned to power with cracks, provide your proposed schedule for the next turbine inspection and the basis for this inspection schedule.
The unit has not been inspected for disc bore cracking.
-~
3 -
2-29-80 VI.
Indicate whether an analysis and evaluation regarding turbine missiles have been performed for your plant and provided to the staff.
If such an analysis and evaluation has been performed and reported, please provide appropriate references to the available documentation.
In the event that such studies have not been made, consideration should be given to scheduling such an action.
The original turbine missile analysis and evaluation report is described in the Appendix G to Section 14.1.15 of the FSAR.
GENERIC QUESTIONS The answers to the generic questions will be supplied within 20 days or when they become available from Westinghouse or the Generic Study Task Force.
If you should have any questions, please do not hesitate to contact us.
Very truly yours, CC Director of Nuclear Regulation U. S. Nuclear Regulatory Commission Washington, D.C.
20555
..0.,)
STATE OF NEW JERSEY SS:
COUNTY OF ESSEX RICHARD M. ECKERT, being duly sworn according to law deposes and says:
I am a Senior Vice President of Public Service Electric and Gas Company, and as such, I signed the response letter dated Febru-ary 29, 1980, to Mr. Darrell G. Eisenhut, Acting Director, Division of Operating Reactors, requested by his letter to Mr. F. P. Librizzi, General Manager - Electric Production, dated February 25, 1980, on the subject of cracking in low pressure turbine discs.
The matters set forth in said response letter are true to the best of my knowledge, information, and belief.
'RICHARD M. ECKERT Subscribed and sworn to before me thisc?f~ day of j~~, 1980.
Notary P blic of N&w Jersey My commission expires on I c:<. /-30 /fl/