ML17339A659
| ML17339A659 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 02/25/1980 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| References | |
| NUDOCS 8003140423 | |
| Download: ML17339A659 (11) | |
Text
fEBRNAY 8 5 589 HKAH590l:IKlIlggjq Docket No. 50-250 Dr. Robert E. Uhrig, Vice President Advanced Systems and Technology Florida Power and Light Company Post Office Box 529100 Miami, F'lorida 33152
Dear Dr. Uhrig:
On December 28,.1979 the NRC Office of Inspection an'd 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 utility users of this potential problem on October 30, 1979 and was requested by the staff to present a similar briefing in
- Bethesda, Haryland 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 )lant.
Westinghouse was later 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 staf'f.
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 Unit 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 tliat you installed crack-free rotors in both low pressure turbines'uring your recent outage and described this action in your letter of January 23, 1980.
In order to permit us to evaluate the potential for cracks in these new rotors we request, that you provide the information listed in En'closure 2
to th$ s letter and your assessment of the safety significance of your responses.
OI IICa~
OUANAMNW DATE~
NRC PORN 518 (9-76) NRCM 0240
~ ~ I
~ ~ ~ ~ I
~ ~
~ ~
~
~ ~
- VO ODVOIINMONIIIINTINODPI ICOI I ~ 'I ~
SOS 10 ~
8 003l40 I
9)@
8 s YRAUA83%
J a> e I
P h
~ 'l f
W ~
Mr. Robert E. Uhrig Because of the general nature of the information sought in Enclosure 2 we are transmitting a copy of this enclosure to Westinghouse by separate letter.
As discussed in'he 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:
l.
IE Information Notice No. 79-37 With Errata Sheet 2.
Pequest for Information Related to
-Turbine Disc Cracks - 20 Day Response
= cc:
w/enclosures See next page
- SEE PREVIOUS YELLOW FOR CONCURRENCES gy ~/~~/r~
gg O/~)/W orrIca&
OIIRNAMCW DATC'2N'OR;ORBl*
DOR:ORB1
- MGrotenhuis:
ASchwencer Ol./R3/GQ..........l f24/80........
WJRoss Ql./23/3Q......
WPGammill
.01./.25/80 DOR:ORBl*
DOR:AD:ORP*
DOR DGE n ut y 9I HRC FORM 818 (9-76) NRCM 0240 I
U,C, OOVCIINMCNTrlIINTINOOrrICCI I ~ 7 ~
1 ~ 0
'ICC
0
/
, Y~ bong)8 lan~ah A
T I
l A
p H
I'
Docket No. 50-250 Dr. Robert E. Uhrig, Vice Pr sident Advanced Systems and Technol Florida Power and Light Compa Post Office Box 529100 Miami, Florida 33152
Dear Dr. Uhrig:
On December 28, 1979 the NRC Office of nspection and Enforcement issued Information Notice No. 79-37 that pre en d information available to the staff related to the discovery of crac s in the keyway and bore sections of Westinghouse 1800 rpm lo press e turbines.
A copy of this Information Notice with errata sheet is closed.
Westinghouse notified utility use s of this pote tial problem on October 30, 1979 and was requested by the st f to present a
milar briefing in
- Bethesda, Naryland on December, 1979.
You were ontacted on December 14, 1979 and invited to send repre ntatives to the staf briefing and also were requested to advise the aff of the actions bein taken in regard to this potential problem at our operating nuclear pow plant.
Westinghouse was later requ ted to meet again with the aff and licensee-users on January 8, 1980 t supplement the information pro ided in the earlier meeting and in int rim correspondence with the staf 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 Unit 2, it is evident that the probability of crack formation in these turbine discs fs significantly greater than previously assumed and the energy of a turbine missile could be greater than postulated by the vendor in earlier safety analyses.
It is my understanding that keyway cracks have been identified in discs in low pressure turbinesat Turkey Point Plant Unit 3 and you are in the process of making the necessary repairs.
We request that the results of your turbine inspections, a description of corrective actions being taken, and justification that this action is sufficient to permit returning this unit to operation, be reported to us prior to resuming operation.
We also request that you provide the information listed in Enclosures 2 and 3 to this letter and your assessment of the safety significance of your responses.
Please contact us if you have any questions concerning these requests.
~ A)F FICE SURNAME
.DATE/.
NRC FORM 318 (9-76) NRCM 0240>>>>
AU.S. GOVERNMENT PRINTING OFF1CE: 3979<89'369
S
/
Jt il
'I
Because of the general nature of the informatio sought in Enclosures 2 and 3 we are transmitting a copy of these en'sures to Westinghouse by separate letter.
As discussed in the Deceg5er 17, 1979 meeting we urge you to address the generic aspects of t
$ s problem and to coordinate your responses through an owner's group.
Si cerely, Darrell G. Eisenhut,,
Acting Director Division of Operating Reactors
Enclosures:
l.
IE Information Notice No 79-37 llith Errata Sheet 2.
Request for Informati Related to Turbine Disc Crac
- 20 Day Respons 3.
Request for Information Related to Turbine Disc Cracks
-. 60 Day Response cc:
w/enclosures See next page OFFICE $
SURNAME OATE $
DOR:ORB1 t<Grotenhui s: g 01/Q/80 DOR:ORB1 I
01/
80 bASc hwerjq DOR:ORBl DO NRossB/
.....1<POsmmsl) 01 /+/8.....1./RSI8.0......
BOR.
DGEisenhut 0.1 /.../&0.
NRC FORM 318 (9 76) NRCM 0240 O'U.S. GOVERNMENT PRiNTING OFFICE: 1979.289'369
~ ~
i[
I
/ W
- N
~~ R~~c Wp
+
0
~y I
$ ')
I 0
+a**+
UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 February 25, 1980 Docket No. 50-250 Dr. Robert E. Uhrig, Vice President Advanced Systems and Technology Florida Power and Light Company Post Office Box 529100 Miami, Florida 33152
Dear Dr. Uhrig:
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 utility users 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 later 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 Unit 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 you installed crack-free rotors in both low pressure turbines during your recent outage and described this action in your letter of January 23, 1980.
In order to permit us to evaluate the potential for cracks in these new rotors we request that you provide the information listed in Enclosure 2
to this letter and your assessment of the safety significance of your responses.
Mr. Robert E. Uhrig February 25, 1980 Because of the genera
. nature of the information sought in Enclosure 2 we are transmittin a copy of 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.
S ncerely,
~
~
~
Darrell
. Ei erihut, Ac ing Director Division of 0 crating Reactors
Enclosures:
1.
IE Information Notice No. 79-37 With Errata Sheet 2.
Request for Information Related to Turbine Disc Cracks - 20 Day Response cc:
w/enclosures See next page
Robert E. Uhrig Florida Power and Light Company February 25, 1980 cc:
Mr. Robert Lowenstein, Esquire Lowenstein, Newman, Reis and Axelrad 1025 Connecticut
- Avenue, N.W.
Sui te 1214 Washington, 0.
C.
20036 Environmental and Urban Affairs Library Florida International Universi ty Miami, Florida 33199 Mr. Norman A. Coll, Esquire
- Steel, Hector and Oavis 1400 Southeast First National Bank Building Miami, Florida 33131 Mr. Henry Yaeger, Plant Manager Turkey Point Plant Florida Power and Light Company P. 0.
Box 013100 Miami, Florida 33101 Mr. Jack Shreve Office of the Public Counsel Room 4, Hollana Building Tallahassee, Floriaa 32304