ML18227B235
| ML18227B235 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 09/29/1977 |
| From: | Robert E. Uhrig Florida Power & Light Co |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18227B235 (22) | |
Text
DISTRIBUTION AFTER ISSUANCE "~ OPERATING LICENSE U.S. NUCI.EAR REGULATORV COMMI N DOCK R NRC FoRM 195 I2 lg)- ~.~~
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F IL NRC DISTRIBUTION foR PART 50 DOCKET MATERIAL FROM DATE OF DOCUMENT TO: ~ .Stello $'lorida Pover .G LightCo Miami, Fla DATE RECEIVED R E Uhrig INPUT FORM NUMSER OF COPIES RECEIVED gl ETTER QNOTORIZED PROP
&ORIGINAL UNCLASSIFIED QCOPV CESCRIPTION EN CLOSU RE 2p License g DPR 31 G 41 Amend: Proposed change to tech specs coneisting of revisions concerni tendon inspections...............
notarized 9-29-77.........=..-........
8p PLANT NAIIE: Turkey Point 3 I
G 4 11-4-77'ehf SAFETY FOR ACTION/INFORMATION BRANCH CHIEF:
INTERNAL D IST Rl BUTIOh G FXL DR I C E (2)
OELD HANAUER CHECK STELLO EISENHUT SHAO BAER BUTLER
'GRIiIIES J. COLLINS EXTERNAL DISTRIBUTION CONTROL NUMBER
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TIC NSIC 16 CYS ACRS SENT CATE 0 Y
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, BOX 013100, MIAMI, FL 33101
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- September 29, 1977 L- ~7- .0.
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Op Office of Nuclear Reactor Regulation Attn: Mr. Victor Stello, Director V/~$$~
Division of Operating Reactors +ep U. S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Stello:
Re: Turkey Point Unit Nos. 3 6 4 Docket Nos. 50-250 and 50-251 Proposed Amendment, to Facility 0 eratin Licenses DPR-31 and DPR-41 In accordance with 10 CFR 50.30, Florida Power 6 Light Company submits herewith three (3) signed originals and forty (40) copies of a request to amend Appendix A of Facility Operating License.
The proposed amendment is described below and shown on the accompanying Technical Specification page bearing the date of this letter i;n the lower right hand corner.
Pa e 4.4-4 Specification 4.4..6 is revised to require inspection of Unit 3 horizontal tendon 64H51 and dome tendon 1D53 instead of 64H50 and 1D27 respectively. Addi-tionally, Specification 4.4.6 is revised to require inspection of Unit 4 horizontal tendons 62H38 and 42H80 and dome tendon 2D3 instead of 13H38, 42H57 and 2D14 respectively.
The, proposed amendment has been reviewed by the Turkey Point Plant Nuclear Safety Committee and the Florida Power,6 Light Company Nuclear Review Board. They have concluded that not involve an unreviewed safety question. A written safety it does evaluation is attached.
~~g 7+>0 PEOPLE... SERVING PEOPLE
i' Office of Nuclear Reactor Regulation Attn: Mr. Victor Stello, Director Division of Operating Reactors Page 2 So that we may avoid non-compliance with our Technical Specifica-tions, we request that your review of this change be completed by October 4, l977.
Very truly yours, Robert E. 'Uhrig Vice President REU/NAK:ltm Attachments cc: J. P. O'Reilly,, Region Robert Lowenstein, Esq.
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'4.4.6 TKKQN SURVZILL<sC:-
Lift>>off Lift-off readings vill be taken for the following aine (9) tendons available for inspection.
Unix 3 'nce a Horizontal 62H18,42H70> 64H51 62838, 42H80~ 64H70 Vertical 23V1,45V7,61Vl 12V29,34V29,56V29-Doma 1D53~2D28,3D28 ~ ~
ID28, 2D3~ 3D28 Wire Inspection One horizontal, one verticaI. aad oaa dome tendon Mll be relaxed and one Mre, will be removed from each as a sample. (At subsequent inspections different tendons will'e used far, the sample).
Wires M11 be visually inspected. for corrosion, and pittiag. Tensile tests Mll be performed oa.
three (3) samples cut from each eire (one, from each ead aad oae from the middle) of a length equal to the ma~~urn leagth acceptable for the, test apparatus to be useci.
After samples are taken, teacioas vi,ll be re-teasioaed and final lift-off readings wwll be taken.
Test >>reoueacv
- Lift-ozf readings and -~re inspection W1I, take place at the end of the first, third and every fifth year therea=ter from the date of the.
structural integ ity t st. Tendon surveillance may be conducted during reactor operation.
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- 4. 4-4 September 29, 1977
IS SAFETY EVALUATION Re: Turkey Point Unit Nos. 3 6 4 Docket Nos. 50-250 6 50-251 Tendon Surveillance Introduction This evaluation supports a proposed change to Technical Specifica-tion 4..4.6 (Tendon Surveillance). The list of Unit 3 tendons is revised to delete tendons 64H50 6 1D27,,and add 64H51 6 1D53. The list of Unit 4 tendons is revised to delete tendons 13H38, 42H57 2D14, and add 62H38, 42H80 & 2D3.
Discussion General Design Criterion- 53, "Provisions for Containment Testing and Inspection" of Appendix A to 10 CFR, Part 50 requires, in part, that the reactor containment be designed to permit (1) periodic inspection of all important areas, and (2) an appropriate surveillance program. The containment design of Turkey'Point Units 3 and 4 pro-vides a pre-stressed concrete structure with ungrouted tendons. An inservice inspection program for surveillance of these tendons was established and is specified in Section 4.4.6 of Appendix A to License Nos. DPR-31 and DPR-41.
Surveillance tendons were chosen, such that a sample was obtained from each major tendon type (dome, vertical and hoop). The specific choices within each type were selected to provide tendons subject to various environmental exposures. Technical Specification 4.4.6 describes the specific items to be covered on each surveillance tendon. Due to the problems described below, it selected..
has been deter-The surveillance mined that substitute tendons should be using the substitute tendons will be performed in the same manner, using the same equipment, as proposed for the original tendons.
Unit 3: uninspected During the first year (1972) and third year (1974) surveillance of Unit 3, tendons 64H51 and 1D27 were inspected. Tendon 64H51 was identified, examined and reported as tendon 64H50. installed Tendon 64H50 has not been and remains in its original con-dition. Since no wires have been removed from tendon 64H50, we plan to leave it intact and continue inspecting future surveillances.
tendon 64H51 during Inspection of dome tendon 1D27 requires that personnel work in the area of the main steam relief and atmospheric dump valve discharges and would thus expose the workmen to an unnecessary hazard should a safety valve or atmospheric steam relief open. Therefore, we plan to inspect tendon lD53 during future surveillances.
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During the third year (1975) surveillance of Unit 4, the three pre-selected horizontal tendons 13H15, 51H50 and 35H70 which comprise a complete hoop were not inspected due to the unnecessary personnel exposure to steam relief and atmospheric dump 'valve discharges as described above. Tendons 13H38, 42H57 and 64H70 were selected and inspected as approved by Amendment No. 11 to Facility Operating License DPR-41. Review of the surveillance tendons shows that further improvement is necessary to diminish the potential personal hazard associated with the surveillance of tendon 42H57. Therefore, tendon 42H80 has been chosen for future surveillance. Also, tendon 62H38 will be inspected in lieu of 31H38 during future surveillances.
The resulting three horizontal tendons to be surveilled (13H38, 42H80 and 62H38) will provide a more representative sampling of the various environmental exposures and will comprise a complete hoop.
To provide additional surveillance information, and to further miti-gate the personal hazard (similar to that describ'ed for tendon "
42H57) associated with surveilling tendon 2D14, dome tendon 2D3 will be utilized.
Evaluation FSAR, page 5.1.2-6 states that any 3 adjacent tendons in any group (dome, vertical or hoop) can be lost without affecting the struc-ture's integrity. FSAR, Section 5.1.7.4, (pg. 5.1.7-6) states that the surveillance tendons (9 in total number) are in excess of design requirements. Also, both FSAR, Section 5.1.7.4 and Technical Specification 4.4.6 requires that the surveillance ten-dons be 'retensioned to the stress level measured in, the tendon at the lift-off reading. Furthermore, FSAR, (Section 5.1.4.4), references ACE 318-63, paragraph 2621(d), which, states that "the total loss of prestress due to unreplaced broken tendons shall not exceed 2 percent of the total prestress." The loss of only two wires (out of a total of 90) does not change the capability of the tendon to perform its function.'Reference'previous Units 3 and 4 Tendon Surveillance Reports.) Thus the surveillance tendons are still available to per-form the tendon design function.
Figures 1 and 2 show the original and proposed surveillance tendons.
An'examination of these figures shows that the proposed surveillance tendons will experience a full environmental exposure.
Unit 3:
0 0 Tendons 64H50 and 64H51 are both located between azimuths. 226 and 346 Tendon 64H50 is at elevation 96'-10" and tendon 64H51 is at elevation 98'-6". Since both tendons are located between the same azimuths at approximately the same elevation, they experience essentially the same environmental conditions.
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IS
Two wires have been. removed from tendon 64H51, but no wires have been removed from 64H50. Since both tendons are in approximately the same location, wire samples from either one would satisfy the intent of Specification 4.4.6. There are no structural safety related consequences associated with having tested tendon 64H51 instead of 64H50.
Since three 120-degree tendons comprising one complete hoop system were inspected (including lift-off readings) during the first year and third year surveillances, the inservice tendon inspection program has met FSAR commitments. .Substitution of tendon 64H51 for 64H50 has, not compromised the inservice tendon inspection program'.
Tendons 1D27 and 1D53 are from the same dome group, have their ends anchored at approximately'he same elevations within the same 60-degree angles, and experience essentially 'the same environmental conditions. Since the influences on both tendons are approximately equal, wire samples .from either one would satisfy the intent of Technical Sepcification 4.4.6. Two wires have been removed from tendon 1D27, but as discussed above, there are no structural safety related consequences associated, with terminating the sur-veillance of lD27 and instead surveilling 1D53. Thus, substituting-tendon lD53 for 1D27 will meet FSAR commitments and will not compromise the inservice tendon inspection program.
Unit 4:
Tendon 42H80 and 42H57 are both located between azimuths 314'nd 74'. Tendon 42H80 is located at elevation 145'8 3/4" and tendon 42H57 is located at elevation 107'4 3/4". Although the change in .
elevation is notable, it is felt to be insignificant. with regard to environmental exposure and is necessary to protect the personnel performing the surveillance. There have been no wires removed from 42H57. Thus, the substitution of tendon 42H80 in lieu of 42H57 will continue to meet FSAR commitments and will not compro-mise the inservice inspection program.
Tendons 62H38 is located between azimuths 74'nd 194't elevation 76'3 5/8". Tendon 13H38 is located between azimuths 14'nd elevation 76 '-10". The tendons are at approximately the same 134't elevation, however, the butress anchorage locations are shifted 60-degrees and might thus experience slightly different environ-mental exposure. Nevertheless, the change is deemed beneficial in that the new group of horizontal tendons will comprise one complete hoop and will thus provide more representative informa-tion during future surveillances. Two wires have been removed from tendon 13H38, but as discussed above, there are no structural safety related consequences associated with terminating the 'sur-veillance of 13H38 and instead surveilling'2H38.
Tendons 2D3 and 2D14 are from the same dome group, have their ends anchored at approximately the same elevations within the same 60-degree angles, and experience essentially the same environmental
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conditions. Since the influences on both tendons are approximately equal, wire samples from either one would satisfy the intent of Technical Specification 4.4.6. There have been no wires removed from 2Dl4. Thus, substituting tendon 2D3 for 2Dl4 will meet the FSAR commitments and will not compromise. the inservice tendon inspection program.
The proposed substitute surveillance. tendons (1) adequately deter-mine the effects of corrosion on the containment structure tendons and (2) satisfy the intent of Regulatory Guide 1.35, "Inservice Inspection of Ungrouted Tendons in Prestressed Concrete Containment Structures." This conclusion is based in part on the Turkey Point Technical Specification requirement that complete tendon surveillance tests be performed on both Units 3 and 4. The requirement that, complete tendon surveillance tests be performed for both units is in excess of the requirements of Regulatory Guide 1.35. Regulatory Guide 1.35 allows visual inspection of the second. of two units located on the same site'if both units were constructed by the same contractor in the same manner at approximately the same time.
The performance of tensile tests and tendon lift-off readings on both units, rather than on just one unit, increases the probability that any variation in tendon performance will be observed.. The wires removed from each tendon group in the containments do not decrease the total prestress below the acceptance level specified in ACI 318-63, paragraph 2621(d) and the FSAR commitments are still valid. We, therefore, conclude that the tendon surveillance test program is not d'iminished in effectiveness by the proposed'hanges.
Conclusions Based on these considerations, (1) the proposed change does not increase the probability or consequences of accidents or malfunc-tions of equipment important to safety. and does not reduce the margin of safety as defined in the basis for any, technical specifica-tion, therefore, the change'does not involve a significant hazards consideration,. (2)'there is reasonable assurance that. the health and safety of the public will not be endangered by operation in the proposed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
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BUTTRESS 6 BOTTOM OF AZIMUTH 346 226 166 106 46o RING GIRDER EL 160'-0"
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64H51 L 98r 64H50 L 96 TOP OF BASE SLAB EL 12'-6"
'DEVELOPED EXTERIOR ELEVATION HOOP AND'ERTICALTENDONS 226
.166'rr rr 1D27 4,
286 I 71I 1 i -8 3/4 r r r ~
r lD53 106 346'UTTRESS BUTTRESS 46 BUTTRESS replacement surveillance PLAN tendon DOiVlfTENDONS ~ ~ original surveillance FLORIDA POWER 8 LIGHT CO.
TURKEY.POINT NUCLEAR POWER PLANT UNIT 3
'POST-TENSIONING SYSTEM SURVEILLANCE TENDONS LOCATION AND IDENTIFICATIOi4 FIGURE 1
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Buttress Number 1 2 BOTTOM OF 74o 14o 3 .ao Z>4o 94o RI1'IG G I P DER Pzimuth 1 1 150'-0" EL 42H&0 EL 14 3/4 fl I 42H57 ~
EL 107 3/4 It 13H38 L 76,'
62H-38, 76s- 5/8" OP OF BASE SLAB EL 12'-6"
'EYELOPED EXTERIOR ELEVATION HOOP AID YERTICAL TENDONS 24'-0 1/&"
254o 14 41'-5 1/8" 2D14 194o I BUTT. RESS 2D3 74 KEY replacement surveillance l130 tendon CL original
'surveillance PLAN FLORIDA POINTER Itt CO.
DO!IE TEHDOHS' POItIT'NUCLEAR POHER PLA'IT 'URt!EY UHIT 4 POST- TE>IS IO I Iti'G SYSTEM I SURYEILLANCE TENDONS LOCATION Ai'ID IDENTIFICATION
i STATE OF FLORIDA )
) ss COUNTY OF DADE )
Robert E. Uhrig, being first duly sworn, deposes and says:
That he is a Vice President of Florida Power & Light Company, the Licensee herein; That he has executed the foregoing document; that the state-ments made in this said document are true and correct to the best of his knowledge, information, and belief, and that he is authorized to execute the document on behalf of said Licensee.
Robert E. rig Subscribed and sworn to before me this day of ( 19 77 NOTARY PUBLIC, in and for the County of Dade, IIDTARY TVGlIC STATE OP TI.CODA et lARGIf MV CDRIMISSIOII EXPIRES AUGUST 24, SD~DED TIIRV W,VI4Ara SOVO'II'a iGEiGV My commission expires:
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