ML19262A671

Submits Proposed Schedule for 791128 Briefing Re Steam Generator Tube Degradation.Viewgraphs Encl

ML19262A671
Person / Time
Site:	Point Beach
Issue date:	11/28/1979
From:	Bickwit L NRC OFFICE OF THE GENERAL COUNSEL (OGC)
To:	Gilinsky V, Hendrie J, Kennedy R NRC COMMISSION (OCM)
Shared Package
ML19262A665	List: ML19262A664 ML19262A671
References
REF-10CFR9.7 NUDOCS 7912100217
Download: ML19262A671 (18)

Text

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n Rico UNITED STATES

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NUCLEAR REGULATORY COMMISSION g %@.,

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November 2c,, 197y, MEMORANDUM FOR:

ChaiIman Hendrie Commissioner 0111nsky Commissioner Kennedy Commissioner Bradford Commissioner Ahuerne FROM:

I Leonard Bickwit, Jr.

General Counsel FUBJECT:

SCHEDULE FOR BRIEFING ON PT. BEACH STEAM GENERATOR TUBE DEGRADATION

• le propose the following schedule for the briefing starting at 2: 30 p.m.

tcday on Pt. Beach:

1)

Staff presentation - 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 2)

Response from Wisconsin Electric Power Co. (Licensee) -

10 minutes 3)

. Response from Wisconsin's Environmental Decade, Inc.

(Petitioners) - 10 minutes 4)

Questions by Commissioners - Remaining time - 10 minutes cc:

OPE S E CY < ' _. m OCA OPA

Contact:

Marian E.

Moe, OCC 634-3224 7912100 N f

'I 1527 127

POINT BEACH UNITS 1 AND 2

SUMMARY

INFORMATION Point Beach Unit 1 Point Beach Unit 2 General Information Start-Up Date:

12/21/70 9/30/72 NSSS Supplier:

Westinghouse Identical Thermal Powe-1518 Mwt identical Number of Loops:

2 Identical Steam Generator Design Steam Generater Type:

Westinghouse Model identical 44 Recirculating No. of Tubes Per Steam Generator:

3260 identical Tube Size:

0.875" OD,0.050" Wall identical Tube Material:

Inconel identical Support Plate Design:

Drilled,0.75 Thick Identical Support Plate Material:

Carbon Steel identical Primary Operating Pressure: 2235 psig identical Secondary Operating Pressure:

821 psig Identical T.S. Primary to Secondary Leak Rate Umit:

500 gpd (0.35 gpm)

Identical Water Chemistry Secondary Water 31.8 efpm Phosphate 18.5 efpm Phosphate Treatment:

36.0 efpm AVT 35.7 efpm AVT Condenser Cooling Water: Lake Michigan Identical Demineralizers:

None Identical Steam Generator Blowdown:

Continuous,25 gpm Identical 1527 128

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TUBE TO TUBESHEET CREVICE GEOMETRY

+--0.875"-+

l l

0.E"+

NOMINAL I

I' O.006" l

l CLEARANCE (xxxxxxx l l wxxxxxw N

g CARBON STEEL TUBESHEET

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SUMMARY

OF STEAM GENERATOR ADVERSE EXPERIENCE 11/28/79 SECONDARY SIDE CRACKING DENTING CONSIDERATION FOR USEND DEEP CREVICE TUBE SP HOUR-SP CRACRING LEAKING UWEND REPLACEMENT NSSS PL ANT 18 AME WASTAGE FREITING CORROSION DENTING GLAS$ LNG OR ISL AN6tNG DENTS CRACK OR RCTUBING CE MAINE YANKEE XMINOR MILLSTONE 2 XMODERATE X

PAtlSADES X

X X MINOR X (Tube $1sswing)

ST. LUCIE 1 X MINOR W

H ADDAM NECK X

X X

X MINOR R.E. GINNA 1 X

X X

X#INOR INDIAN POINT 2 X MODER ATE X

X X

t INDIAN POINT 3 X MINOR X

NORTl2 ANNA 1 X

PolNT BE ACH I X

X X

X MODERATE POINT BEACH 2 X

X-MO DE R ATE X (7)

H.B. HOBINSON 2 X

X X

X MINOR SAN ON0FRE 1 X

X X

X-EXTENSIVE X

X X

SURRYI X

X EXTENSIVE X

X X

X X

SURRY 2 X

X-EXTENSIVE X

X X

X X

TROJAN X

TURKEY PolNT 3 X

X E XTENSIVE X

X X

X TURKEY PolNT 4 X

X-EXTENSIVE X

X X

X X

YANKEE ROW X

-J

' SCC - CAUSTIC STRESS CORROSION CRACKING NOTES: 1.10 DAT E THERE ARE 33 0PERA'.'ING PWR UNITS (NOT INCLUDING INDI AN P0lNT 1) WHICH UTILIZE RECIRCUL ATION TYPE OF STE AM UJ GENERATORS.

2.17 HAVE BEEN FOUNO TO HAVE ONE OR MORE FORM (S) 0F DEGRADATION AS SUMMARIZED ABOVE.

3. TROJAN AND D.C. COOK HAVE HAD INDICATIONS OF LIMITED DEGRADATION IN RECENT INSPECTIONS.

POINT BEACH UNITS 1 AND 2 STEAM GENERATOR OPERATING HISTORY Point Beach Unit 1 Date of Outage Chemistry Leak Rate Tubes Plugged 12/21/70 Phosphate 9/30/72 72 GPD 197 4/6/74 2

2/29/75 AVT (9/74) 180000 GPD 157 11/16/75 10 10/1/76 6/24/77 200 GPD 1

10/4/77 2/1/78 130 GPD 1

5/24/78 90 GPD 1

9/20/78 560 GPD 11 3/1/79 225 GPD 9

8/5/79 2100 GPD 97 8/29/79 324 GPD 5

10/5/79 145 Point Beach Unit 2 Date of Outage Chemistry Leak Rate Tubes Plugged 8/2/72 Phosphate 3/8/73 10/17/74 7

8/11/75 AVT 580 GPD 3

2/26/76 18 3/4/77 7

3/25/78 145 GPD 2

3/13/79 255 GPD 1

1527 132

e POINT BEACH UNIT 1 STEAM GENERATOR TUBE PLUGG1HG llISTORY TUBES PLUGGED 6 ATE OF THINNING OR CREVICE OUTAGE DENTING CRACKING CORR 0SI0ft A

B A

A A

A 12/21/70 12/21/70 87 91 9/30/72 1

1 11 / 6 / 7 11 59 98 2/26/75 6

II 11/16/75 10/1/76 6 /211/ 7 7 1

10/11/77 10 1

2 2/1/78 6

11 9/20/78 G,

1 3/1/79 Z

8 1

52 11 5 8/5/79 u

8/29/79 u

2 10/5/79 70 6 11

e STEAM GENERATOR TUBE DEGRADATION PROBLEMS AT POINT BEACH UNIT 1 e WASTE & CAUSTIC SCC I

ABOVE TUBE SHEET (1971-1975)

TUBE SHEET f

h/

. oENTiNG (,97s-,978)

Fe3 4 0

-=

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e DEEP CREVICE CRACKING

($

WITHIN TUBE SHEET (1977 TO PRESENT) r 1527 134

POINT BEACH UNIT 1 S/G TUBE PLUGGING AND LEAKAGE DUE TO DEEP CREVICE CRACKING No. Plugged Tubes Date S/G - A S/G - B Leaking Tubes 12/70-10/77 0

0 10/4/77 1

2 9/20/78 6

4 1 (560 GPD) 3/1/79 8

1 1 (225 GPD) 8/5/79 52 45 3 (2090 GPD) 8/29/79 2 (+3)*

1 (324 GPD) 10/5/79 70**

64**

• Examination of Tubesheet Photo Showed 3 Tubes Plugged Previously U

• • 17 Tubas in S/G-A and 13 in S/G-B Were Classified Defective Because of the More Sensitive Equipment Being Used in October, C

1979. These 30 Tubes Probably Should Have Been Plugged in August,1979.

AUGUST AND OCTOBER 1979 ECT HISTOGRAMS DEPTH OF WALL PENETRATION S.G.1 A S.G.1B 40.5 % 40.6 %

38.6 %

g O

O 34.1 %

o o

5 5

E E

14.1 %

12.1 %

8.8%

g g

2.5 % 3.4 %

2.6%.1.8%

1%

40 50 60 70 80 90 100 40 FO 60 70 80 90 100

% THROUGH WALL

% THROUGH WALL LOCATION IN TUBESHEET S.G.1 A S.G.1B

-c

--c 42.4 %

24.1 %

I 20',

=

c C

@b 26.4 %

21.4 %

e g 15"-

m "' 15" -

%g 16.0 %

h 27.7 %

m g 10~-

8 g 10~

gH 15.2%

gH 23.2 %

g 5-m 5~ -

3.6%

% OF INDICATIONS

% OF INDICATIONS 1527 136

SUMMARY

OF LAB EXAMINATIONS AND TESTS Mechanical Test Show:

o Properties of Unaffected Core Materials Similar to Virgin Material e Burst Tests Indicate That Corrosion Limited to Tube Sheet Crevice e Burst Strength of Tube Directly Above and Below TS Similar to Virgin Materials.

Outside the Tube Sheet:

e 40% Remaining Tube Wall Required and is Indicated to Exist e Leak Before Break Criteria Valid and Will Require Shutdown Prior to Tube Rupture.

Inside the Tube Sheet:

e 10% Remaining Tube Wall Required and is Indicated to Exist e Ductility Will Allow Tube to Expand to Contact Tube Sheet (i.e., No Tube Burst During MSLB)

G e Collapse Not Possible Due to Confinement Z

e Leaks Within Tubesheet Will Either be Deep Enough That the Tube Cannot Pull Out or Leakage Will Require Shutdown.

d

SUMMARY

FOR THE UNIFORM WASTAGE CONDITION Requirements e Minimum Tube Thickness Outside Tubesheet Must be Greater Than.020 Inch I:40% of Wall) e Equivalent Tube Thickness Inside Tubesheet Must be Greater Than.005 inch 1: 10% of Wall) e The Ductility of the Tube Inside the Tubesheet Must Allow Expansion to the Tubesheet Wall

~,

u D

Condition of the Tubes Examined and Tests Performed Indicate That These Requirements Are Met

~

VI.

SUMMARY

AND CONCLUSI0NS 0

INSPECTION, PLUGGING, IESTING APPROACH OvER SHORT IIME O

' CRACKING / IGA IS INSIDE IUBE SHEET 0

L0w PRIMARY COOLANT ACTIVITY LIMITJ LOW LEAKAGE LIMITS 0

UNDER ACCIDENT CONDITIONS, DON'T EXPECT RUPTURES O

CONSIDERING LONGER IERM SOLUTION O

OTHER ACTIONS QA 0F PLUGGING RECHECKING PROCEDURES SPECIAL OPERATOR RETRAINING 1527 139

NOTE: IMMEDIATE ACTION REQUIRED

.g g\\.-

c300 f.t@TOTiOe November 14, 1979 BY PERSONAL MESSENGER Mr. Samuel J. Chilk, Secretary U. S. Nuclear Regulatory Comission Washington, D. C. 20555 Re: Point Beach Nuclecr Plant Unit 1 Docket No. 50-266

Dear Mr. Chalk:

Please find enclosed for docketing in the above referenced matter an original and twenty copies of the Petition of Wisconsin's Environmental Decade, Inc., dated November 14, p 79.

The Petition seeks im=ediate entry of an order to show cause and proposed order enjoining Wisconsin Electric Power Corpany from reopening Point Beach Nuclear Plant Unit 1 on or about November 17, 1979, to be temporarily effective pending further order determining that the limiting conditions for operation as pertain to steam generator tubes have been met and that certain reviews have been conducted.

Inasmuch as the relief which we seek will be in large measure mooted if the utility retums the unit to service on November 17, 1979, before the Commission has acted, we respectfully request that you schedule this matter for immediate consideration and action by the full Comission.

At the same time, this is to request notice of any application by Wisconsin Electric Power Company to increase the limiting condition for operation of Point Beach Nuclear Plant Unit 1 in regard to steam generator tubes and an adequate opportunity to respond before any action is taken.

Your attention is appreciated.

Sincerely, WISCONSIN'S ENVIRONMENTAL DECADE, INC.

I b

f tt./Jd...

Th. f4.2/c KATHLEEN M. FALE General Counsel

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cc: Wisconsin Electric Power Company 152 g 4Q Enclosures

UNITED STATES OF AMERICA BEFORE THE NUCLEAR REGULATORY C0FNISSION POINT BEACH NUCLEAR PLANT UNIT 1 DOCKET NO.

50-266 PETITION OF WISCONSIN'S ENVIRONMENTAL DECADE, INC.

I.

INTRODUCTION 1.

This Petition to the U. S. Nuclear Regulatory Commission (hereinafter referred to as the " Commission") by Wisconsin's Environmental Decade, Inc.(here-inafter referred to as the " Decade"), seeks immediate entry of an order to show cause and order enjoining Wisconsin Electric Power Company (hereinafter referred to as ";;isconsin Electric"), operating licensee of the Point Beach Nuclear Plant Unit 1(heminafter refermd to as " Point Beach"), from re pening ssM facility at the end of its present refueling cycle, to be temporarily effective pending further order determining that the limiting conditions for opera' tion as pertain to steam generator tubes have been met and that the potential safety consequences of steam generator tube degradation have been reviewed and the applicable regula-tory guides and technical specifications revised accordingly to protect the public health and safety, 1527 141 J

II.

THE PETITIONER 2.

Petitioner Decade is a non-stock, not-for-profit Wisconsin corporation organized under ch.181 of the Wisconsin Statutes, with offices at 114 East Mifflin Street in Madison, Wisconsin 53703, for the primary purpose of protecting and g

&h'

. enhancing the quality of the human and natural environment, including protection against undue risks posed by power production facilities. %e Decade has approx-imately 700 members residing within and outside the State of Wisconsin, including members residing in the inrediate vicinity of Point Beach. He Decade has become increasingly concerned as to the continued operation of the facility in the face of manting evidence that Wisconsin Electric is placing economic and political considerations before safety considerations in its decisions and judgments m1ating to the plant's tube deFradation problem.

III. PERSON UPON M10M SERVICE MAY BE MADE 3.

We person upon whom service may be made is Ms. Kathleen M. Falk, General Counsel, Wisconsin's Envimnmental Decade, Inc.,114 East Mifflin Street in Madison, Wisconsin 53703.

IV.

JURISDICTION 4.

Eis Petition is brought before the Commission pursuant to 42 U.S.C.

secs. 2233(d), 2236(a) and 2237,10 C.F.R. secs. 2.204, 2.206(c)(1) and 50.36(c)(2) and the inherert supervisory authority of the Commission to oversee all aspects of the nuclear regulation and licensing process.

5.

We Decade has made no prior request for a notice of vio1' tion or order a

to show cause to the Director of Inspection and Enforcement pursuant to 10 C.F.R.

sec. 2.206 because: (1) the Staff of the Commission is already fully aware of the violations set forth below and has determined, reeting in informal session with the licensee and the reactor vendor Westinghause Electric Corporation, to take no action (see: Memorandum of L. Smith to the File of the Public Service Commission of Wisconsin, dated November 7,1979, at 3MiC as Appendix A); (2) the time consumed in fi of the Commission before appealing to the C5 Entire document previously of relief in view of the licensce's present entered into system under:

to service on November 17, 1979(see: M., a ANO N

f Pages:

1527 142

.