ML19309A310

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Forwards Description of Proposed Augmented Insp Program for Portions of Main Steam & Main Feedwater Sys
ML19309A310
Person / Time
Site: Rancho Seco
Issue date: 08/24/1973
From: Davis E
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To: Anthony Giambusso
US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8003270737
Download: ML19309A310 (5)
v • d • e


Text

_ _ - _ - - _ _ _ _ _ _ -_.

AEC DI~ IIBUTION FOR PART 50 DOCKET MA'r~IAL (TDiPORARY FORM)

CONTROL nog 6570 FILE:

FROM:

DATE OF DOC DATE REC'D LTR MEMO RPT OTHER Sacramento Municipal Utility District Sacramento, Calif. 95813 E. K. Davis 8-24-73 8-28-73 X

TO:

ORIG CC OTHER SENT AEC PDR X

SENT LOCAL PDR X Mr. Gimmh m 1 migned CLASS UNCLASS PROP INFO INPUT NO CIS REC'D DOCKET NO:

XXX 1

50-312 DESCRIPTION:

ENCLOSURES:

Ltr trans the following:

Proposed Inspection Program - Main Steam

& Main Feedwater Systems.

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Rancho Seco Unit No. 1 N'M he -

FOR ACTION /INFORMATION

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$SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S Street, Box 15830, Sacramento, Califomia 95813; (916) 452-3211 August 24, 1973

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'r ~r-Mr. Angelo'Giambusso

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U. S. Atomic Energy Conmission i

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' 4,,, A N AEC Docket No. 50-312 Rancho Seco Nuclear Generating Station, Unit No. 1

Dear Mr. Giambusso:

The Sacramento Municipal Utility District hereby submits a description of the proposed augmented inspection program for portions of the main steam and main feedwater systems. This information doctments the District's commitmen't for an augmented inspection consistent with current AEC requirements.

Sine rely yours, e

dVre E. K. Davis General Manager Enclosures

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AN ELECTRIC SYSTEM SERVING MORE THAN 600.000 IN THE HEART OF C A t I F O R N t f.

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PROPOSED INSPECTION PROGRAM MAIN STEAM AND MAIN FEEDWATER SYSTEMS Postu' lated Breakooints (PB) identified in attached figures I.

Baseline examination of 100% of all (PB) welds using same inspec-1.

tion technique proposed for inservice inspection' _

2.

Inservice inspection with following schedule:

100% volumetric inspection of all (PB)

First 3-1/3 years welds 100% volumetric inspection of all (PB)

Second 3-1/3 years welds 100% volumetric inspection of all (PB)

Third 3-1/3 years welds 1

1007. volumetric inspection of all (PB)

Every 10 years there-i after welds If repair of any (PB) welds are required, the inspection schedule 3.

will revert back to the first 10 year program.

1 Inspection method for the termination welds will be radiography.

4.

Inspection method for other (PB) welds will be ultrasonic.

II.

Other welds in critical area Baseline examination of 100% of all welds in a critical area.

1.

Inservice inspection of welds in a critical area in accordance 2.

with Regulatory Guide 1.51, " Inservice Inspection of ASME Code Class 2 and 3 Nuclear Power Plant Components" following the schedule specified in the Winter 1972 Addendum of ASME XI.

Visual inspection of the piping insulation surfaces for evidence of III.

leakage will be performed weekly.

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THESE VALUES ARE LOCATED IN 4f THETURBINE AREA BUT THERE THESE VALUES ARE LOCATED IN IS NO EQUIPMENT REQUIRING THE TURBINE AREA EUT THERE PROTECTION FROM PIPEWHIP.

IS NO EQUIPMENT REQUIRING PROTECTION FROM PIPE WHIP.

THE LARGE LETTERS PB REPRESENT POSTULATED BREAK LOCATIONS AND ARE JHE PolNTS WHERE AUGMENTED INSERVICE INSPECTION WILL BE PERFORMED.

ARROWS DEPICT POSTULATED LINE BREAK VECTORS (5 POINTS).

NUMERICAL VALUES DEPICT COEFFICtENTS FOR COMPARISON WITH THE 0.8 IN 0.8 (Sh + SA) BASED ON SUM OF PR6 MARY AND SECCNCARY STRESSES.

NUMERICAL VALUES IN PARENTHESIS DEPICT COEFFICIENTS FOR COMPARISON WITH THE 0.8 IN 0.8 SA BASED ON SUM OF PRIMARY AND SECONDARY STRESSES.

MAIN STEAM DUMP ISOMETRIC CHANGE * ~ ~ "l

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St to k'p-t THE LARGE LETTERS PB REPRESENT POSTULATED BRAKE LOCATIONS AND ARE

.THE PolNTS WHERE AUGMENTED INSERVICE INSPECTION WILL BE PERFORME0.

ARROWS DEPICT POSTULATE 0 LINE BREAK VECTORS UO POINTS)..

NUMERICAL VALUES DEPICT COEFFICIENTS FOR COMPARISON WITH THE 0.8 IN 0.8 (Sh + SA) BASE 0 ON SUM OF PRIMARY AND SECONDARY STRESSES.

NUMERICAL VALUES IN PARENTHESIS CEPICT COEFFICIENTS FOR COMPARISON WITH THE 0.8 IN 0.8 SA BASE 0 ON SUM OF PRIMARY AND SECONDARY STHESSES.

MAIN FEEDWATER ISOMETRIC CHANGE ~~5

. h4NN SACRAMENTO MUNICIPAL UTiUTY DISTRICT

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