ML20117D077
| ML20117D077 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 08/19/1996 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ULNRC-3422, NUDOCS 9608280166 | |
| Download: ML20117D077 (9) | |
Text
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1901 Choutsav Avenue Post DHice Box 149 St. Louis, Missouri 63166 314-554 2650 i
Union.
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M August 19, 1996 U.
S. Nuclear Regulatory Commission ATTN:
Document Control Desk Mail Station F1-137 Washington, D.C.
20555-0001 Gentlemen:
ULNRC-3422 CALLAWAY PLANT DOCKET NUMBER 50-483 REQUEST FOR ALTERNATIVE EXAMINATION REQUIREMENTS FOR THE CALLAWAY PLANT INSERVICE INSPECTION PROGRAM PLAN
References:
- 2) ULNRC-3378 dated May 15, 1996 i
Reference 2 transmitted Relief Request ISI-07A to the Callaway Inservice Inspection Program Plan.
i However, Union Electric has determined that this e
request would be more appropriate if submitted as a proposed alternative examination.
Therefore, ISI-07A has been revised and is resubmitted as ISI-07B per 10CFR50. 55a (a) (3).
ISI-07B replaces Relief Request ISI-07A in its entirety.
Additional component specific information, which supports the alternative i
examination, is included in the attachment to this letter.
NRC approval of this submittal is requested by October 1, 1996 so that this change-may be implemented for Refuel 8.
If you have any questions concerning this information, please contact us.
ll Very trul
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%82gO O
3 onald F.
Schnell G
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Attachment
cc:
T. A. Baxter, Esq.
Shaw, Pittman, Potts & Trowbridge 2300 N.
- Street, N.W.
Washington, D.C.
20037 M. H.
Fletcher Professional Nuclear Consulting, Inc.
19041 Raines Drive Derwood, MD 20855-2432 L.
Joe Callan Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive Suite 400 Arlington, TX 76011-8064 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulato'ry Commission i
8201 NRC Road Steedman, MO 65077
)
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Kristine M. Thomas (2)
Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission l
1 White Flint, North, Mail Stop 13E16 l
11555 Rockville Pike Rockville, MD 20852-2738 Manager, Electric Department Missouri Public Service Commission P.O. Box 360 Jefferson City, MO 65102 Ron Kucera Department of Natural Resources P.O. Box 176 Jefferson City, MO 65102 Don Woodlan i
TU Electric i
1601 Bryan Street Dallas, TX 75201-3411 Pat Nugent Pacific Gas & Electric Regulatory Services P.O. Box 56 Avila Beach, CA 93424
STATE OF MISSOURI
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SS COUNTY OF CALLAWAY
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Donald F.
Schnell, of lawful age, being first duly sworn upon oath says that he is Senior Vice President-Nuclear and an officer of Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
By Donald F. S'chhell
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Senior Vice President Nuclear SUBSCRIBED and sworn to before me this
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day af A//gfif7 1996.
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JA GARK IEptnRY FISUC STATE OF M1000URI COL 2 COUNTY MYCOMM!ssioN EXP.OF ll1 d, / 97 h
AI,TERNATIVE EXAMINATION REOUEST ISI-07B (Page 1 of 6)
COMPONENT FUNCTION Code Class:
I and 2
Reference:
IWA-5242(a)
Examination Categ,ory:
B-P and C-H Item Numbers:
All item Numbers Listed Under Examination Categories B-P and C-H
==
Description:==
Alternate Rules for Insulation Removal During IWA-5(XX) Pressure Tests at Bolted Connections in Systems Borated for the Purpose of Controlling Reactivity Component Numbers:
Bolted Connections for Components Listed in Table 1 CODE REOUIREMENTS ASME Section XI,1989 Edition, Paragraph IWA-5242(a) states,"For systems borated for the purpose of controlling reactivity, insulation shall be removed from pressure retaining bolted connections for visual examination VT-2."
BASIS FOR PROPOSED AI,TERNATIVE Authorization for a proposed alternative is requested from the requirement to remove insulation for visual VT-2 examination of bolted connections during a system pressure test on systems borated for the purpose of controlling reactivity. Union Electric believes that removal ofinsulation at bolted connections for the sole purpose of visual examination will result in hardship and unusual difficulty without a compensating increase in the level of quality and safety for the reasons listed below per 10CFR50.55a(a)(3)(ii):
- 1) The visual VT-2 examination of the Reactor Coolant System (RCS) is performed following the majority of all outage maintenance activitics and just prior to reactor criticality. The RCS is at a normal operating temperature and pressure (557 F and 2235 psig) during the pressure test as required by IWA-5000. Perfonnance of a visual VT-2 examination for the subject bolted connections, re-installation ofinsulation, and disassembly of scaffolding under these conditions is a personnel safety hazard.
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- 2) The anticipated exposure ibr these exams, based on a best case analysis from past experience (best RCS cleanup), is 11 Person-Rem. This is approximately 9% of the total budgeted dose for Refuel 8.
- 3) DifTerential thermal expansion occurs when insulation is removed from a bolted connection which creates a greater chance for leakage. When insulation is removed, the flanges expand at a rate greater than the bolts causing stress on the connection. Once the bolts expand, the stress causes the equivalent of reducing the torque for the connection. The connection then has a higher probability ofleaking.
- 4) Code Class I and 2 systems borated for the purpose of controlling reactivity are extensive and are located in many arcas inside and outside of containment on multiple clevations. ScalTolding will be required to access many of the bolted connections. In addition, many of the bolted connections are located in diflicult to access areas and in medium to high radiation areas. Insulation removal 4
combined with scaffolding requirements will increase outage costs. Approximately 590 insulator manhours and 428 scalTolder manhours would be added to Refuel 8 to support the performance of these VT-2 exams. Based on craft hourly labor rates as of June,1995 for outage work, this equates to
$38,495. The VT-2 is perfonned between modes 3 and 2 ascending, which normally has a duration of six to eight hours. Under the new requirements, critical path time will be extended several hours to accommodate the insulation installation and sca1 Told removal inside the bio-shield wall and throughout
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ALTERNATIVE EXAMINATION REOUEST ISI-07B
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(Page 2 of 6) containment aller the examination is comp!ctc. Outage cost is currently estimated at $400,000 per day.
Union Electric believes that the Callaway programs and the alternative examination proposed below, provide an acceptable level of safety and quality for bolted connections in systems borated for the purpose i
of controlling reactivity. This alternate exam satisfies the requirements of 10CFR50.55a(a)(3)(i).
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- 1) In response to NRC Generic Letter 88-05, Union Electric established a program to inspect all boric acid leaks discovered in the containment building and to evaluate the impact of those leaks on carbon steel or low alloy steel components. All evidence ofleaks, including boric acid crystals or residue, is inspected and evaluated regardless of whether the leak was discovered af power or during an outage.
Issues such as the following are considered in the inspection and evaluation: 1) cvidence of corrosion or metal degradation,2) effect the leak may have on the pressure boundary, 3) possibility of boric acid traveling along the inside ofinsulation on piping. and 4) possibility of dripping or spraying on other components. Based on this evaluation, appropriate corrective actions are initiated to prevent reoccurrence of the leak and to repair, if necessary, any degraded materials or components.
- 2) In addition to the nondestructive examinations required by ASME Section XI, Union Electric has committed to the bolting examination requirements of NRC Bulletin 82-02. In accordance with this Bulletin, at least two nondestructive examination techniques (e.g., ultrasonic, liquid penetrant, magnetic particle, or visual VT-1) are performed on bolted connections of the following components:
Steam Generator primary manways, Pressurizer primary manway, Pressurizer safety valves, and a total of 22 Reactor Coolant System isolation valves that are greater than 6" NPS. As a minimum, two nondestructive examination techniques are used whenever the bolted connection of one of the subject components is disassembled for maintenance or other inspection. These examinations ensure that degradation mechanisms such as Stress Corrosion Cracking or corrosion do not go undetected in bolted connections critical to reactor safety.
- 3) All bolted connections on Callaway's Class 1 and 2 borated systems are either SA-564 Grade 630 studs with SA-194 Grade 6 nuts or superalloy SA-453 Grade 660 studs with SA-194 Grade 6 or SA-453 Grade 660 nuts. The stainicss stects were designed to be resistant in corrosive applications. This is substantiated for the 410 stainicss stects (SA-194) and the 17-4 Pli stainicss steels (SA-564) by EPRI Report NP-5769 which attests to the resistance of stainicss stects to boric acid corrosion.
EPRI Report TR-102748 further confirms in section 7.2.1 that the 410 stainless stects and 17-4 Pli stainicss steel are superior to low alloy and carbon steel bolting materials. Material test reports from Armco Steel Corporation and Republic Steel delineate a superior corrosion resistance in the 17-4 PH stainless steel over standard hardenable chromium stainless stects and equivalence to Type 304. The 410 stainicss steel is an acceptable nut material because the nuts only experience compressive stress and tensile stresses are required for initiation of stress corrosion cracking. Therefore, only studs comprised of 410 stainless steel are potentially susceptible to stress corrosion cracking.
EPRI Report TR-102748 also includes the A-286 (SA-453) as a superior fastening material. The superalloy was designed for resistivity to acid corrosion environments due to its high nickel and chrome content and the inclusion of molybdenum specifically to inhibit inorganic acids such as boric acid. These materials have been further evaluated by material selection expert C.P. Dillon who was subcontracted for Union Electric by Nickel Laboratories. Ilis evahation concludes that "the development ofintermediate concentrations of boric acid solution in the flange area (due to minor i
leaks and evaporation of the water) would not attack the bolting significantly and would be a marked improvement over low-alloy stect assemblics."
AIIITRNATIVE EXAMINATION REOUEST ISI-078 (Page 3 of 6)
To ensure that degradation mechanisms in these metals are mitigated, Union Electric maintains a program at the Callaway Plant that controls materials (insulation, thread lubricant, boron, hy drogen sulfide, molybdenum disulfide etc.) that may come in contact with safety related components, including lx,lting. This program ensures that impuritics are not present in concentrations that would promote development of Stress Corrosion Cracking in stainless steel bolted connections.
Additionally, Union Electric places a very high emphasis on leak prevention, which is the root cause of boric acid corrosion concerns in boltedjoints. Callaway's leak reduction program is outlined in EPRI Report TR-102748. At Callaway, bolted connections utilizing these fasteners are only preloaded 35% to 50% of their yield stress. This is below the threshold values that causes stress corrosion cracking for these materials. Additionally, the UNC bohing thread form that was evaluated by NUREC CR-3604 is deeper than the code required bolting thread form. Thread form of 8 TPI or liner is utilized at Callaway as required by ANSI Bl.1 and the ASTM specifications of each material.
This finer thread form further minimizes the potential for stress corrosion cracking.
The only carbon steel bolted connections at the Callaway Plant in systems borated for the purpose of controlling reactivity are Steam Generators Manways, Reactor Coolant Pump Bohing and Pressurizer Manways. These areas will be inspected for leakage by plant programs with the insulation removed.
PROPOSED Al>TERNATIVE EXAMINATION Bolted connections fabricated from materials resistant to boric acid corrosion in systems borated for the purpose of controlling reactivity shall receive a visual VT-2 cxamination during the system pressure tests of IWB-5000 and IWC-5000 with the insulation installed. If evidence ofleakage is detected, either by discovery of actis e leakage or evidence of boric acid cry stals, the insulation shall be removed and the bolted connection shall be re-examined and, if necessary, evaluated in accordance with the corrective measures of Subarticle IWA-5250, Carbon sicci bolted connections within the Inservice Inspection boundaries uill receive an inspection for boric acid residuc with the insulation removed. In addition, a VT-2 inspection will be perfonned in accordance with ASME Section XI requirements with the insulation installed at normal operating pressure and temperature.
Ifinsulation is removed for planned maintenance, repair, or other inspection at a bolted connection in a system borated for the purpose of controlling reactivity, a visual examination shall be pcrformed on the bolted connection prior to disassembly and, if evidence ofleakage is discovered, evaluated in accordance with the correctisc measurcs of Subarticle IWA-5250.
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Tabla 1 Page 4 of 6 l
Altemative Examination Request ISI-078 i
class 1 Bolted Connections that are insulated on Systems borated for the purpose of controlling reactivity.
l Component l Stud Matenal ll Bott/ Stud Processing and Testing Results ll Nut Matenal l
Nut Processing and Testing Results
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BB8010A SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 302/321. RC 27 SA-194 Gr 6 1100 *F Tempenng. RC 27 BB80108 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 302/321. RC 27 SA-194 Gr 6 1100 *F Tempenng. RC 27 BB8010C SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 302/321, RC 27 SA-194 Gr 6 1100 *F Tempering. RC 27 888085 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 288/306 SA-194 Gr 6 1050 *F Tempenng. 30/32 RC BB8948A SA-453 Gr 660 1800 *F Liquid Quench.1325 "F Hardening Treatment. BHN 306 SA-453 Gr 660 1650 *F Od Quench,1325 *F Hardening Treatment, BHN 311/331 BB89488 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment. BHN 302/321 SA-453 Gr 660 1800 *F Liquid Quench 1325 *F Hardening Treatment. BHN 302 BB8948C SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 278/313 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment l
BB8948D SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 302/311 SA-453 Gr 660 1800 *F Liquid Ouench.1325 *F Hardening Treatment BB8949A SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment BHN 277/321 SA-194 Gr 6 1125"F Tempenng RC 29/31 BB8949B SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 309/329 SA-193 Gr B6 1100 *F Tempenng. RC 41 BB8949C SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment. BHN 309/329 SA-193 Gr B6 1100 *F Tempenng. RC 41 BB8949D SA-453 Gr 660 1800 *F Liquid Quench 1325 *F Hardening Treatment. BHN 309/329 SA-193 Gr B6 1100 *F Tempenng, RC 41 BBPCV0455B SA-453 Gr 660 1650 *F Liquid Quench 1325 *F Hardening Treatment. BHN 321 SA-194 Gr 6 1075 *F Tempering. RC 25"26 BBPCV0455C SA-453 Gr 660 1650 *F Uqud Quench.1325 *F Hardening Treatment. BHN 321 SA-194 Gr 6 1075 'F Tempenng. RC 25/26 BBV0008 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempering BBV0009 SA-453 Gr 660 1800 *F Liquid Quench 1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempering BBV0028 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng BBV0029 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng BBV0047 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng BBV0048 SA-453 Gr 660 1800 *F Liquid Quench.1325 'F Hardening Treatment SA-194 Gr 6 1100 *F Tempering BBV0065 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng BBV0066 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng BBV0067 SA-453 Gr 660 1800 *F Liquid Quench 1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng EJHV8701 A SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 278/291 SA-453 Gr 660 1800 *F Ltquid Quench,1325 *F Hardening Trea%ent EJHV8701 B SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 302/311 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment EM8815 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment. BHN 313 SA-194 Gr 6 1100 *F Tempenng. RC 31-35 EMFE0924 SA-564 Gr 630 1100 *F Tempenng. RC 33/34 SA-194 Gr 6 1100 *F Tempenng EMFEO925 SA-564 Gr 630 1100 *F Tempenng. RC 33/34 SA-194 Gr 6 1100 *F Tempering EMFE0926 SA-564 Gr 630 1100 *F Tempenng. RC 33/34 SA-194 Gr 6 1100 *F Tempenng EMFE0927 SA-564 Gr 630 1100 *F Tempenng. RC 33/34 SA-194 Gr 6 1100 *F Tempering Note: SA-193 Grade B6 meets the requirements of SA-194 Grade 6 when used as a nut. Both are 410 Stainless Steels.
- = Component is currently being evaluated for permanent removal of insulation.
Tabla 1 Paga 5 of 6 l
Altemative Examination Request ISI-07B class 2 Bolted Connections that are insulated on Systems borated for the purpose of controlling reactivity and are located outside of containment.
Component l Stud Matenat ll Bolt Heat Treatment ll Nut Matenal ll Nut Heat Treatment EJ8724A SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment, BHN 285/306 SA-194 Gr 6 1800 *F 1 hr. Oil Quench. 575 *F 2 hr. Tempenng. 41/42 RC EJ87248 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment, BHN 291/306 SA-194 Gr 6 1100 *F Tempenng. RC 32/34 EJ8730A SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment, BHN 302 SA-193 Gr B6 1100 *F Tempering, BHN 248/352 EJ8730B SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment, BHN 302 SA-193 Gr B6 1100 *F Tempering, RC 27/32 EJ8856A SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng EJ8856B SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment SA-194 Gr 6 1100 'F Tempenng EJ8958A SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment. BHN 285/298 SA-193 Gr 86 1100 *F Tempenng. RC 41 EJ89588 SA-453 Gr 660 1800 *F Liquid Quench,1325 "F Hardening Treatrnent, BHN 285/298 SA-193 Gr B6 1100 *F Tempenng RC 41 EJFCV0610 SA-564 Gr 630 1100 *F Tempering, RC 34'35 SA-194 Gr 6 1050 *F Tempenng RC 24/25 EJFCV0611 SA-564 Gr 630 1100 *F Tempenng. RC 34/35 SA-194 Gr 6 1050 *F Tempenng. RC 24'25 EJFCV0618 SA-564 Gr 630 1100 *F Tempering. RC 35.2 SA-194 Gr 6 1100 *F Tempering, RC 26/27 EJFCV0619 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempering EJFE0610 SA-564 Gr 630 1100 *F Tempering BHN 341 SA-194 Gr 6 1105 "F Tempenng. RC 27/28 EJFE0618 SA-564 Gr 630 1100 *F Tempenng BHN 341 SA-194 Gr 6 1105 *F Tempenng. RC 27/28 EJFE0619 3A-564 Gr 630 1100 *F Tempenng BHN 331/341 SA-194 Gr 6 1105 *F Tempenng, RC 27/28 EJFE0988 SA-564 Gr 630 1100 *F Tempenng, BHN 331/341 SA-194 Gr 6 1105 *F Tempering. RC 27/28 EJFE0611 SA-564 Gr 630 1100 *F Tempering BHN 331/341 GA-194 Gr 6 1105 "F Tempenng, RC 27/28 EJF00007 SA-564 Gr 630 1100 *F Tempenng, BHN 341/352 SA-194 Gr 6 1100 *F Tempering. RC 27/28 EJFOOOO8 SA-564 Gr 630 1100 *F Tempenng. BHN 341/352 SA-194 Gr 6 1100 *F Tempenng. RC 27/28 EJHCV0606 SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng EJHCV0607 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment SA-194 Gr 6 1100 *F Tempenng EJHV8716A SA-453 Gr 660 1800 *F Liquid Quench,1325 "F Hardening Treatment, BHN 311/321 SA-194 Gr 6 1100 "F Tempenng. RC 43 EJHV87168 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment, BHN 311/321 SA-194 Gr 6 1100 *F Tempenng, RC 32/34 EJHV8804A SA-453 Gr 660 1800 *F Liquid Quench.1325 *F Hardening Treatment, BHN 311/332 SA-194 Gr 6 1100 *F Tempenng, RC 4&41 EJHV8804B SA-453 Gr 660 1800 *F Liquid Quench,1325 "F Hardening Treatment, BHN 30&329 SA-194 Gr 6 1100 *F Tempering. RC 43 EJHV8809A SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment, BHN 278 SA-453 Gr 660 1800 *F Liquid Quench,1325 'F Hardening Treatment BHN 302 EJHV88090 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment, BHN 291/338 SA-453 Gr 660 1800 "F Liquid Quench,1325 *F Hardening Treatment, BHN 302 EMFE0917A SA-564 Gr 630 1100 *F Tempenng. RC 39 SA-194 Gr 6 1105 *F Tempering. RC 27/28 EMFE09178 SA-564 Gr 630 1100 *F Tempenng. RC 39 SA-194 Gr 6 1105 *F Tempenng. RC 27/28 EMHV6801A SA-453 Gr 660 1800 *F Liquid Quench 1325 *F Hardening Treatment. BHN 288/306 SA-194 Gr 6 1100 *F Tempering. RC 30/32 EMHVS901B SA-453 Gr 660 1800 *F Liquid Quench 1325 *F Hardening Treatment, BHN 288/306 SA-193 Gr B6 1100 *F Temcenng. BHN 248/352 EMHV8803A SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment BHN 288/306 SA-193 Gr B6 1100 *F Tempenng. BHN 248/352 EMHV88038 SA-453 Gr 660 1800 *F Liquid Quench,1325 *F Hardening Treatment, BHN 288/306 SA-193 Gr B6 1100 *F Tempenng, BHN 248/352 PEJ01A SA-564 Gr 630 1800 *F Liquid Quench,1325 *F Hardening Treatment BHN 269/302 SA-193 Gr B6 1100 *F Tempenng BHN 269/277
- EJSS0002 SA-564 Gr 630 1100 *F Tempenng, BHN 331/341 SA-194 Gr 6 1100 *F Tempenng. RC 27/28 PEJ01B SA-5C4 Gr 630 1800 *F Liquid Quench,1325 "F Hardening Treatment. BHN 321/332 SA-193 Gr B6 1100 *F Temoenng. BHN 262/269
- EJSS0001 SA-564 Gr 630 1100 *F Tempenng. BHN 331/341 SA-194 Gr 6 1100 *F Tempenng. RC 27/28 Note: SA-193 Grade B6 meets the requirements of SA-194 Grade 6 when used as a nut Both are 410 Stainless Steels.
- = Component is currentty being evaluated for permanent removal of insulation
Tabla 1 Page 6 of 6 Attemative Examination Request ISI-07B Class 2 Bolted Connections that are insulated on systems borated for the purpose of controlling reactivity and are located inside containment.
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Component ll Stud Matenal ll Bolt Heat Treatment ll Nut Matenal l]
Nut Hmt Treatment BGHV8146 SA-453 Gr 660 11 ann *F Liquid Quench.1325 *F Hardening Treatment, BHN 311/332 SA-194 Gr 6 1100 *F Tempenng. RC 27T33 BGHV8147 SA-453 Gr 660 l1300 *F Liquid Quench.1325 *F Hardening Treatment, BHN 311/332 SA-194 Gr 6 1100 *F Tempe vig. RC 27/33 BGHV8145 SA-453 Gr 660 '1800 *F Liqutd Quench.1325 *F Hardening Treatment, BHN 341 SA-194 Gr 6 1100 *F Tempenng. RC 27/28 EJF01 SA-564 Gr 630 1100 *F Tempering. BHN 331/341 SA-194 Gr 6 1100 *F Tempenng. RC 27/28 EJF02 SA-564 Gr 630 1100 *F Tempenng. BHN 331/341 SA-194 Gr 6 1100 *F Tempenng. RC 27/28 EJF03 SA-564 Gr 630 1100 *F Tempenng. BHN 331/341 SA-194 Gr 6 1100 *F Tempenng, RC 27/28 EJF04 SA-564 Gr 630 1100 *F Tempering. BHN 331/341 SA-194 Gr 6 1100 *F Te cenng RC 27/28 Note: SA-193 Grade B6 meets the requirements of SA-194 Grade 6 when used as a nut. Both are 410 Stainless Steels.
- = Component is currently being evaluated for permanent removal of insulation.
- -