DCL-84-067, Forwards Response to NRC Request to Identify & Provide Basis for Acceptance of Welded ASTM A-325 Bolting in Pipe Support Design,Per 840119 Site Visit
| ML20087P001 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 02/17/1984 |
| From: | Schuyler J PACIFIC GAS & ELECTRIC CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML16340E249 | List:
|
| References | |
| DCL-84-067, DCL-84-67, NUDOCS 8404050318 | |
| Download: ML20087P001 (6) | |
Text
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,'EX. 3 (6 pages) pg.1 of 6 PACIFIC GAS.A.ND. ELE C T RIC C C MPANY
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February 17, 1984
.i PGandE Letter No: DCL-84-067 Mr. John B. Martin, Regional Administrator U. S. Nuclear Regulatory Conssission Region Y 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368 Re: Docket No. 50-275, OL-DPR-76 Diablo Canyon Unit 1 Weiding of A-325 Bolts
Dear Mr. Martin:
As a result of the January 19, 1984 exit interview at Diablo Canyon Power Plant, the NRC requested PGandE to. identify the scope and provide the basis for acceptance of welded ASTM A-325 botting in pipe support design.
The enclosure to this letter provides the PGandE response to these questions.
Kindly acknowledge receipt of this material on the enclosed copy of this letter and return it in the enciosed addressed envelope.
5incerely, k.
J. 8. Hoch for J. O. Schuyler Enclosure f
v cc:
T. W. Bishop D. G. Eisenhut G. W. Knighton H.'E. Schierling l l6.
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EX. 3 pg. 2 of 6 PGandE Letter o.: DCL-84-067 ENCLOSURE WELDING OF A-325 BOLTS
.4ELUEST FOR INFORMATION The NRC requested PGandE to identify the scope and provide the basis for l
acceptance of welded ASTM A-325 bolting in pipe support design.
RESPONSE
Weided ASTM A-325 bolt design has been used in only 10 pipe supports, numbers 4S/4G through 9G and 59H/lG through 4G. These pipe succorts are on the co=ponent cooling water system lines to the contain=ent fan coolers and are attached by A-325 bo'lts weided to the fan cooler support structure. The bolts are all 5/8" diameter and are welded to ASTM A-36 steel. Project procedures and their referenced standards and codes do not provide for this application of A-325 bolting. However, PGandE has researched the material properties and allowable stresses used in bolt evaluation and has determined the installation to be acceptable.
The bolts used are A-325 Type 1.
ASTM material standards indicate that the chemical properties of A-325 Type 1 are similar to ASTM A-105. The i
appropriate sections of these standards are attached as References 1 and 2.
i The carbon and manganese content are nearly identical and there are no alloying elements such as chromium, nickel, a molybdenum. Therefore, since A-105 is a P-1 material. A-325 Type 1 can be considered a P-1 material based on chemical property considerations.
A-325 Type i bolts are provided in a quenched and tempered condition. The bolts were welded to A-36 steel (P-1 material) using welding procedures for P-1 materials. The fitups and the co=pleted welds were visually insmected and acceptance was documented. The tendency for cold cracking of welds increases when welding high strength materials; however, since cold cracking is easily detected by visusi inspection, PGandE is confident the welds are crack free.
Welding of these bolts ca'ises the propertias to cnange from those associated with a quenched and tempered condition to those associated with a normalized condition. The change in physical properties causes allowable stresses to be reduced toward those of A-307 Grade 3.
Calculations show that these bolts are qualified using A-307 Grade B allowables.
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asserdaag to Mahod A 317. DetaEs of the test shan be agrund upon betwesa the maan.
SS. Magustic.Partisie Exammaales fasurer and the purchaser.
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E Psudese Aemisels tisse method. The method shan be is assord.
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from aos randomly selected forging repre. Acceptance limits shan be as agreed spoa
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agreed upon by the manufacturer and the p : E da!! bs apphed by the manafas.
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f Standard Specification for HIGH-STRENGTH BOLTS FOR STRU CTURAL STEEL
- JOINTS, INCLU DING SUITABl.E NUTS AND PLAIN HARDENED WASHER 3' E
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8*"* 888 S'"88-and n=wnnaical requirements of various types of quenched and tempered stael bolts com-1.2 Wten the twe of bohs is not steeT6ed?
soonly known as "high-strength structural T>ce I cons saatt se sue *ee _ Type 2 as N
bottn." seiended for une is structural jonets Type i oosu may be suppuce D3 the mansfs:
that are co ored under requirements of the turers if agreed upon by the purcasser Specifications for Structural Joints Using 1.3 when atmosphene corroaion resntans ASTM A 323 or A 490 Solts.' issued by the is reqstred. Type 3 bolu shall be spectGed *-
4 Research Counci os Riveted and Bolted the purchaser in any mquiry or orcer.
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Structural Jomu of the Engineenns Founda-1.4 Sunsene nuts and plain hardened==>4 tion. The various types of bolts covered in than ers are also covered by thu spectiicauon.
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bun.teri.
oplied in sues '!. to i '!. tn inch-be **.stmanet unless ethe' <henen*wsnal recuire anenu are supulated m tae pur:hase inqu:r save. sa diameter.
1.1.2 Tipe 2-Botts made from what is and order. Dimensions of washers are hmite to those ta the Specincation ior Structur.
generally desenbed as lo=-carbon rr attensate steel. succued in sues 'Is to I ta, iacieure, m Joinu Usmg ASTM A 325 or A 400 bon diameter.
cated in f.i.
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ASTM Spenficauon A So3. for Careon sta ASTM Spectfication A 588. for High-Nuta.* or Grace 2H of ASTM Speadcana Strength Low. Alloy Structural Staal =tta
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and the menefacturer may add echer 9.2 The inspector representing the es denungsseheng marks indimeting then the aus is staaer shall how free metry, at all uses 39
.maisopherie servossee Pa=6aat and of a merb se the sentreet of the perehaser a tr -
useshersag type, basakings sesy be reised er performed, to all parts of manufastere*
dupesomed as tas opasse e( the meselecturer. works that sensern the mesofacture est i
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ferd the seapester all russeenhas fassister l
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ties shall be rease at the pises of manasa.-
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type.' hearkness en top or bottom surfaces and shall tse se conducted as set to iner smalt he depressed.
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