ML14184A178
| ML14184A178 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 02/25/1980 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Jackie Jones Carolina Power & Light Co |
| References | |
| NUDOCS 8003140471 | |
| Download: ML14184A178 (4) | |
Text
R IRLE R LE FEBRUARY
) -BLDI Docket No. 50-261 Mr. J. A. Jones Senior Executive Vice President Carolina Power and Light Company 336 Fayetteville Street Raleigh, North Carolina 27602
Dear Mr. Jones:
On December 28,- 1979 the NRC Office of Inspection and Enforcement issued Information-Notice No. 79-37 that presented information available to the staff related to the discovery of cracks in the keyway and bore sections of Westinghouse 1800 rpm-low pressure turbines..A copy of this-Information Notice with errata sheet is enclosed.
Westinghouse notified utilityusers of this potential problem on October 30, 1979 and was requested by the staff to present 'a similar briefing in Bethesda, Maryland on December 17, 1979. You were contacted on.December 14,.
1979 and invited to send representatives to the staff briefing and also were requested to advise the staff of the actions being taken in regard to this potential problem at your operating nuclear-power plant.
Westinghouse was late'r requested to meet again'with the staff and licensee users on January 8, 1980 to supplement the information provided in the earlier meeting and in interim correspondence with the staff.
'On the basis of information provided'by Westinghouse and recent indications from turbine disc inspections now underway at Arkansas Nuclear One Unit 1,.Beaver Valley Unit 1 and Indian Point Uni.t 2, it is.evident that the probability of crack formation in these turbine discs is significantly greater than previously assumed by the vendor. It is my understanding that a partial inspection of your turbine was made in 1979. We request that you document your justification for.continued operation until a full UT inspection is made of all discs and all defects thus identified are corrected. Therefore, in accordance with 10 CFR 50.54(f), you are requested to provide within 20 days of the date of this letter, or in any event prior t6.restart if.your unit is not operating, written statements, si'gned under. oath or affirmation, which will enable the staff to determine whether ornot your license to operate H. B. Robinson Unit No. 2 should be modified, suspended, or revoked.
As part of your statement,,you should provide and address the safety significance of the information requested in Enclosure 2 of this letter.
SURNAM E..........!......
DATE NRC FORM 318 (9-76) NRCH 0240 U.S. GOVERNMEN PRINN OFFICE 1978 - a-R 6O I
-h 7.1
Mr. J. A. Jones
- 2 Because of the general nature of the information sought in Enclosure 2 we are transmi-tting a copyof this enclosure to Westinghouse by separate letter.
As discussed in the December-17, '1979 meeting we urge you to address the generic aspects of this problem and to coordinate your responses through an owner's group.
Sincerely, Original Signed By Darrell G. Eisenhut,. Acting Director.
Division of Operating Reactors
Enclosures:
- 1.
IE Information Notice No. 79-37 With Errata. Sheet
- 2. Request 'fo, Ibformation-Related to Turbine Disc Cracks -
20 Day Response cc: w/enclosures See next page
- SEE PREVIOUS YELLOW FOR CONCURRENCES, DOR:ORB1 DOR:ORB1...
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GOVERNMENT PRINTING OFFICE: 1978 - 265-76
Docket No. 50-261 Mr. J. A. Jones Senior Executive Vice President Carolina Power and Light Company 336 Fayetteville Street Raleigh, North Carolina 27602
Dear Mr. Jones:
On December 28, 1979 the NRC Office of Inspection and Enforcement issued Information Notice No. 79-37 that pres nted information available to the staff related to the discovery of cracks in the keyway and bore sections of Westinghous6Nl 00 rpm low pressure turbines. A copy of this Information Notice wit errata heet is enclosed.
Westinghouse notified utility u-4ers of this potential problem on October 30, 1979 and was.requested by the stf to present a similar briefing in Bethesda, Maryland on December 17, 1979. You were contacted on December 14, 1979 and invited to send represen at'ves to the staff briefing and als~o were requested to advise the sta f of he actions being taken in regard to this potential problem at yo r opera ing nuclear power plant.
Westinghouse was later request to meet ain with the staff and licensee
-users on January 8, 1980 to su plement the nformation provided in the earlier meeting and in interi correspondenc with the staff.
On the basis of information rovided by Westingh use and recent indications from turbine-disc inspecti s-now underway at Ark sas Nuclear One Unit 1, Beaver Valley Unit 1 a Indian Point Unit 2, it is evident that the probability-of crack ormation in these turbine
- scs is significantly greater than previously ssumed and the energy of a tu ine missile could be greater than p stulated by the vendor in earlie safety analyses.
It is my understanding that a partial inspection of your rbine was made in 1979. We request at you document your justification r continued operation until a ful UT inspection is made of all discs an \\#11 defects thus identified are orrected. Therefore, in accordance with 10 CFR 50.54(f),
you are requested to provide within 20 days of the date of this letter, or in any event prior to restart if your unit is not operating, written statements, signed under oath or affirmation, Which will enable the staff to determine whether or not your license to operate H. B. Robinson Unit
- No. 2 should be modified, suspended, or revoked.
As part of your statement, you should provide and address the safety significance of the information requested in Enclosure 2 to this letter.
O F F IC E..................................
S U R N A M E NRC FORM 318 (9-76) NRCM 0240
- U.S.
GOVERNMENT PRINTING OFFICE
.19)79-289-369
2 Likewise, you are requested to provide and address the 7afety significance of the information in Enclosure 3 within 60 days of thedate of this letter.
Because of the general nature of the information sou/ht in Enclosures 2 and 3 we are transmitting a copy of these enclosurbs to Westinghouse by separate letter. As discussed in the December 1/7, 1979 meeting we urge you to address the generic aspects of this pr blem and to coordinate your responses through an owner's group.
Sincerel Da rell G. Eisenhut, Acting Director D vision of Operating Reactors
Enclosures:
- 1. IE Information Notice No. 79-37 With Errata Sheet
- 2. Request for Information Relat d to Turbine Disc Cracks - 20 y Respo se
- 3. Request for Information Re ated to Turbine Disc Cracks -
Day Respons cc: w/enclosures See next page OFFIC'O-R DOR:0RB1 10R:0RB1 DOR-D O
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80 NRC FORM 318 (9-76) NRCM 0240 U.S. GOVERNMENT PRINTING OFFICE 1979-289-369