ML20058F455
| ML20058F455 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 07/09/1982 |
| From: | Dircks W NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Fascell D HOUSE OF REP. |
| Shared Package | |
| ML20058A651 | List: |
| References | |
| NUDOCS 8207300503 | |
| Download: ML20058F455 (7) | |
Text
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DISTRIBUTION w/o enclosure
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Docket File w/ incoming (50-250/251)1 G. Snyder NRC PDR w/inc PPAS Local POR w/inc M. Grotenhuis w/inc S. Hanauer 21.9 G82 ED0 Reading C. Parrish R. Mattson ORB 1 File SECY (82-0647)
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R. DeYoung The Honorable Dante B. Fascell M. Bridgers (ED0-12031) V. Stello United States House of Representatives Program Support Staff, NRR Washington, D. C.
20515 M. Jambor J. 0/Reilly M. Stine G. Cunningham
Dear Congressman Fascell:
D. Eisenhut L. Underwood J. Heltemes H. Thompson This letter is in response to your letter of June 18, 1982, which made reference to the Turkey Point Plant Unit Hos. 3 and 4 steam generator problem.
As a matter of background infomation all three steam generators of the Turkey Point Plant Unit No. 3 have already had the steam generator tube section replaced and the unit has been operating since April 1982. Turkey Point Unit No. 4 is scheduled for a similar repair operation to begin in October 1982. Both units have had an essentially leak-free operation for over three years (no leaks clearly above the threshold of detection).
During the weekend of June 5/6 Unit 4 shutdown because of several steam leaks from inside the shield wall at the hand hole cover and at valves on the steam generator secondary side. The increase in temperature and humidity led to a licensee decision to go to cold shutdown and repair the leaks.
With the steam generators drained the licensee also examined the steam generator primary side. Ilydrostatic pressure was applied to the secondary side with the primary side open so that the tubc. sheet was visible. Three tubes in steam generator C which had been preventively plugged in a previous inspection were wet. This is characteristic of what is temed a " weeping" plug and no action was taken. A " weeping" plug is simply a tube that has been plugged, has no measurable leakage and yet shows wetness in a hydro-static test.
In steam generator C the same hydrostatic test revealed a tube which dripped water at a rate which was below the threshold of detection. However this tube and the four imediately surrounding it were preventively plugged. Steam Generator A showed no wetness at the tube sheet.
The measurement of the rate of primary to secondary leakage prior to shutdown showed a fairly constant 0.6 to 1.0 gallons per hour. This has been typical for " weeping" plug (s) at the Turkey Point Plant in the past and is about the threshold level for detecting leaks for that plant. The leak rate limit at which the facility is required to shutdown for steam generator tube inspection is 18 gallons per hour.
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The Honorable Dante 8. Fascell You asked the following questions:
1.
On what information is the fiRC basing its approval of the Florida Power and Light Company's request?
2.
What bearing do the events in the steam generator tube rupture accident at the Ginna Plant in New York have upon the Turkey Point Plant?
In response to question number 1. I enclose a copy of Amendment No. 80 which was issued for Turkey Point Unit No. 4 to pemit operation until October 1982.
Included is the Safety Evaluation Report which is the basis for the issuance of the amendment. Briefly, the conservative plugging program, which has proved successful over the past four years, the leak-free operation of both units, the operation of other similarly degraded steam generators, the extensive inspection of both denting and wastage and finally, special conditions regarding steam generator tube leakage were added to the already existing special license conditions.
In response to question number 2, there are several special actions now under consideration by the staff, based on recent experience which includes the Ginna information.
Regarding the Turkey Point Plant Unit Hos. 3 and 4, those units already have certain of the additional requirements being considered and have been operating under special surveillance requirements. They also presently have loose parts monitoring systems, which are currently being updated.
I trust that this has been responsive to your request.
Sincerely, (Signed) William J.Dircks William J. Dircks Executive Director for Operations
Enclosure:
Amendment No. 80 SEE PREVIOUS NRC FORM 318 FO h CURRE'lCES*
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You asked the following questions:
s On what information is the flRC basin its approval of the Florida Power and Light Company's request?
2.
What bearing do the events in the steam generator tube rupture ccident at the Ginna Plant in licw York have upon the Turkey Point Plant?
In respo e to question number 1. I enclose a copy of Amendment rio. 80 which was issued Ypr Turkey Point Unit flo. 4 to permit operation until October 1982.
Included is the Safety Evaluation Report which is the basis for the issuance of thb amendment. Briefly, the conservative plugging program, which has proved uccessful over the past four years, the leak-free operation of both ' nits, the operation of other similarly degraded steam generators, the exthqsive inspection of both denting and wastage and finally, special condi ions regarding steam generator tube leakage were addedtothealreadyex(itingspeciallicenseconditions.
In response to question nu r 2, there are special actions now under consideration by the staff, luding some results of the Task Action Plan study regarding steam gen tors.
Unit Nos. 3 and 4 those units already In regard to the Turkey Point Plan x have been operating under special surge 111ance requirements and already have had loose parts monitoring systems which are currently being volun-tarily updated.
I trust that this has been responsive to yo request.
Sincerely, William J. Dircks Executive Directbr for Operations
Enclosure:
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DISTRIBUTION
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DocRet File w/ incoming (50-250/251)
NRC PW w/inc Local PDR w/inc SECY (82-0647)
EDO Reading
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M. Bridgers (ED0-12031)
Program Support Staff, NRR The norable Dante B. Fascell M. Jambor Uni d States House of Representatives M. Stone Was ngton, D. C.
20515 D. Eisenhut J. Heltemes
Dear ongressman Fasce11:
M. Grotenhuis w/inc C. Parrish This le ter is in response to your letter of June 18, 1982, which made reference \\ o the Turkey Point Plant Unit ilos. 3 and 4 steam generator problem.
As a matter ofxpackgmund information all three steam generators of the Turkey Point Plant Unit tio. 3 have already had the steam generator tube section replaced'and the unit has been operating since April 1982. Turkey Point Unit No. 4 i's scheduled for a similar repair operation to begin in October 1982. Both units have had an essentially leak-free operation i
for over three years '(no leak's clearly above the threshold of detection).
During the weekend of June 5/6 Unit 4 shutdown because of a steam leak from the steam generator secondary side. The increase in temperature and k
humidity led to a licensee. decision to go to cold shutdown and repair the leaks.
With the steam generators drained the licensee also examined the steam generator primary side. Nothing'was out of order. Hydrostatic pressure was applied to the secondary sidehith the primary side open so that the tube sheet was visible. Thrce tubes in steam generator C which had been s
preventively plugged in a previous inspection were wet. This is charac-teristic of what is termed a " weeping" plug and no action was taken. A
" weeping" plug is simply a tube that has\\been plugged, has no measurable leakage and yet shows wetness in a hydrostatic test.
In steam generator C the same hydrostatic test revealed a tube'which dripped water at a rate l
which was below the threshold of detection. However this tube and the four irxediately surrounding it were preventiv$1y plugged. Steam Generator I
A showed no wetness at the tube sheet.
The measurement of the rate of primary to secondary leakage prior to shutdown showed a fairly constant 0.6 to 1.0 gallons per hour. This has i
been typical for " weeping" plug (s) at the Turkey Point Plant in the past and is about the threshold level for detecting leaks for that plant. The leak rate limit at which the facility is required to shutdown for steam generator tube inspection is 18 gallons per hour.
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The lionorable Dante B. Fascell You asked the following questions:
\\n' what infomation is the flRC basin its approval of the Florida Power 1.
ahd Light Company's request?
2.
Wha' bearing do the events in the steam generator tube rupture acci ent at the Ginna Plant in flew York have upon the Turkey Point Plant?\\
In response to\\ question number 1, I enclose a copy of Amendment lio. 80 which was issued for Turkey Point Unit lio. 4 to permit operation until October 1932.
Included ih the Safety Evaluation Report which is the basis for the s
issuance of the amendment. Briefly, the conservative plugging program, which has proved successful over the past four years, the leak-free operation of both units, the operation of other similarly' degraded steam generators, the extensive inspection of both denting and wastage and finally, special conditio'ns regarding steam generator tube leakage were added to the already existing special license conditions.
N In response to question number 2, there are a number of special actions y
now under consideration by the s,taff, including some results of the Task Action Plan study regarding steam generator. These actions have not been issued as yet but the staff has under consideration such specific requirements as television inspection, of the secondary side of the steam generator, loose parts monitoring systems, more stringent surveillance requirements for the steam generator tbbes, etc.
Broad areas of consid-eration are steam generator integrity, plant systems response, human factors, radiological consequences and organizational response.
N In regard to the Turkey Point Plant Unit fiosw 3 and 4 those units already have been operating under special surveillanc'e requirements and already have had loose parts monitoring systems, which'are currently being volun-tarily updated.
I trust that this has been responsive to your request.
\\
Sincerely, \\
\\
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William J. Dircks Executive Director for Operations N
Enclosure-
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Amendment flo. 80 N
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