ML20112D736

Forwards Tendon Accessibility Info,Rationale for Tendon Surveillance & Info Re Corrosion Mechanism in Response to 840720 & 1029 Requests for Addl Info.Tendons Considered Acceptable If No Major Mods Necessary

ML20112D736
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/14/1984
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
P-84523, TAC-54639, NUDOCS 8501140464
Download: ML20112D736 (32)

Text

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s public service company oe cdondo December 14, 1984 Fort St. Vrain Unit No. 1 P-84523 Regional Administrator bb Region IV U. S. Nuclear Regulatory Commission g[g l J gg 611 Ryan Plaza Drive, Suite #1000 Arlington, Texas 76011 j ATTN: Mr. E. H. Johnson

SUBJECT:

Information Requested on the Fort St. Vrain Tendons 4

REFERENCES:

1.) NRC Letter, R. P. Denise to 0. R. Lee 7/20/84 (G-84252) 2.) NRC Letter, E. H. Johnson to 0. R. Lee 10/29/84 (G-84413)

Dear Mr. Johnson:

In response to the above references we are forwarding t;ie tendon accessibility information, our rational for tendon surveillance and information on the corrosion mechanism.

Inaccessible Tendon Distribution Map Attachment 1 provides the requested tendon accessibility information.

The distribution map indicates which tendons are not accessible for lift off and/or visual inspections. Tendons were considered accessible if no major modifications, such as removal of main structural components and the rerouting of high energy piping were necessary (see accessibility criteria for details). Some of the tendons designated as accessible in Attachment 1 will require future modifications to, in reality, make them accessible. The type of obstruction for inaccessible tendons has been noted in the attached study.

TendonSurveillance(SeeAttachment2)

PSC plans to adopt the NRC's proposed tendon surveillance program (Reference 1 above) with minor changes. The surveillance will be based on accessible tendons. The accessibility study shows that most of the tendons are accessible.

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o In the future, when it has been confirmed that corrosion has been arrested and that no further degradation is taking place, the surveillance rate for lift off tests and the visual inspections should gradually (as defined by the surveillance program attached) change to a 5 year inspection rate. Also, when it has been confirmed that there is no further degradation, the percentage of visual inspection for the longitudinal and bottom crosshead tendons should revert back to its original value of 5%.

The corrosion sample wire program was changed to assure that sample wires are installed in areas of known corrosion. The original Technical Specification required a minimum sample wire length of 15 feet or half the tendon length whichever is shorter. Since these sample wires will be installed in tensioned tendons and in some cases into the interior of the bundle, it is not practical to maintain this minimum length. Based on our knowledge of the areas of corrosion, the sample wire will be of sufficient length to monitor the corrosion that has been identified.

Corrosion Mechanism The metallurgical reports have been issued and are currently under evaluation. The metallurgists have concluded that microbiological corrosion is the primary mechanism with secondary affects of what is believed to be general corrosion and stress corrosion cracking. The metallurgical reports are presently being evaluated and will be sent to you as part of an overall Engineering Evaluation at the end of December.

Please be aware that Attachment 2 represents our rational for the tendon surveillance program and is not to be construed as the official technical specification submittal that will come at a later date.

We trust that this provides you with the requested information.

If there are any further questions concerning the PCRV tendons, please contact myself or Mr. M. H. Holmes at (303) 571-8409.

Very truly yours, M1C Ngba

0. W. Warembourg, Manager Nuclear Engineering Division DWW/MJF/sem

Attachment 1 s

s TENDON ACCESSIBILITY L

Page 1 of 21 o Attachment 1 6

Tendon Accessibility Criteria

" Inaccessible" is defined as only those tendons which cannot be visually or lift-off tested because of the following limitations.

A.) Building steel which cannot be cut out of the way or reasonably modified to provide for temporary removal.

B.) Instrumentation required for plant operation or which can be removed only during a plant shutdown. Instrumentation of such a sensitive nature that its integrity would be jeopardized by any such removal operations.

C.) System piping which cannot be permanently modified to provide tendon access. Generally, this would be piping such as headers and subheaders whose flow characteristics would be negatively affected by a configuration change.

D.) Thermal system piping such as Main Steam which could only be temporarily cut out since it must be returned to its "as found" configuration. Due to pipe settling and creep stresses, it would be very difficult to properly reinstall any cut out sections.

E.) System valves and operators which are necessary for isolation and/or loop segregation. This involves only major large bore header and subheader valves.

F.) Contaminated and/or primary coolant system boundary valves and piping.

G.) Electrical conduit of two inch or larger which would require the shutdown of Class I systems for its removal.

This restriction would also involve cable trays.

H.) Any platform steel, grating, ductwork, etc., whose temporary removal would involve a grossly large and unjustifiable manpower requirement.

I.) Piping or building steel which could not be rewelded after cutting out_due to being directly adjacent to the PCRV concrete.

J.) Areas completely inaccessible to rigging the tendon jacks and tools. Due to their size and weight, the jacks cannot be physically brought to the tendon anchorage location.

K.) Tendons directly adjacent to load cell tendons. The close proximity and increased size of a load cell anchorage blocks the placement of a tendon jack on adjacent anchorages.

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ACCESSIBLE TENDONS (Lift-Off) q Tendon Group Both Ends Accessible One End Only Accessible Neither End Accessible Top Crosshead 24 total tendons l Tendons -6 w/one end accessible 6 tendons w/one end only 2 tendons w/neither end

-2 w/neither end access. accessible accessible T6 w/both ends accessible 24 Total Tendons 16 6 '

- = 25% 2 = 8%

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Botton Crosshead Tendons 24 Total Tendons 24-8 4 = 17% 4 = 17%

T = 66% 24 24 Circumferential Tendons 310 Total Tendons 310-74 = 76% 62 = 20% E = 4%

310 310 310 Longitudinal Tendons No Botton Head 74 = 82% E = 18% i Longitudinal 90 90 Tendons are > o.

90 Total Tendons Accessible y ew:

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Page 4 of 21 i Attachment 1 o

Tendons Not Accessible for Lift-Off Vertical Tendons (Top Head)

• Lift-offs are not applicable at the bottom head end.

The following tendons are not accessible for lift-off testing due to interfering System 23 piping or other major items.

VI- 3 V0-28 VI- 5 VI-32 VI- 6 VI-33 VI- 9 VI-34 VI-12 V0-35 VI-13 VM-36 VI-26 VI-37 VI-28 VI-41 Top Crosshead Tendons L

TO U1 Both ends; 46 System valves, HV-46253-1 & 2 and conduit and 6 pipes L

TI U1 Both ends; 46 System valves, HV-46253-1 & 2 and conduit and 6 pipes R

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T0 M1 Major platform steel R

TI M1 Sharpy penetration l

T0 M2 Major building steel

Paga 5 of 21 s Attachment 1 Circumferential Tendons CM 2.1 Next to load cell CM 3.1 Next to load cell C0 4.1 Dewpoint moisture monitor CM 4.1 Dewpoint moisture monitor CI 4.1 Dewpoint moisture monitor C0 5.1 Dewpoint moisture monitor CM 5.1 Dewpoint moisture monitor CI 5.1 Dewpoint moisture monitor C0 9.1 HV-46259-1 CO 16.1 46 System subheader CI 17.1 SUC #2 conduit - (4")

CO 18.1 Ductwork CM 2.2 Next to load cell CM 3.2 Next to load cell C0 5.2 Dewpoint moisture monitor CM 5.2 Dewpoint moisture monitor CI 5.2 Dewpoint moisture monitor CO 9.2 Major structural steel C0 10.2 Both ends; major floor steel at both ends CM '.0.2 Major floor steel CI 10.2* Major floor steel CM 11.2 Next to load cell CO 12.2 Structural steel CO 18.2 System 23 piping CM 18.2 System 23 piping CO 7.3 Both ends; major floor steel at both ends CM 7.3 Both ends; major floor steel at both ends CI 71 Both ends; major floor steel at both ends CM 8.3 Next to load cell CI 9.3 46 System subheader and structural steel .

CM 17.3 Next to load cell CO 18.3 46 System subheader CM 1.4 Next to load cell, large System 22 pipe CM 2.4 Large System 22 pipe CM 7.4 Next to load cell CO 11.4 Major structural steel CI 11.4 Major structural steel CM 17.4 Next to load cell CI 18.4 Both ends; major structural steel at both ends

Pag 2 6 of 21

. Attachment 1 CO 5.5 Dewpoint moisture monitor CM 5.E Dewpoint moisture monitor CI 5.5 Dewpoint moisture monitor CO 6.5 Dewpoint moisture monitor CM 6.5 Dewpoint moisture monitor CI 6.5 Both ends; dewpoint moisture monitor and ductwork CO 7.5 Floor steel CM 7.5 System 25 pipe CI 7.5 Both ends; System 25 pipe and ductwork CI 8.5 Ductwork C0 10.5 Structural steel CI 10.5 HV-46259-1 CM 17.5 Next to load cell CO 18.5 Both ends; 46 System subheaders at both ends CM 18.5 Next to load cell CO 19.5 Both ends; structural steel and no access CM 19.5 Both ends; structural steel and cable tray CI 19.5 Structural steel CM 1.6 Next to load cell CO 2.6 Floor steel C0 4.6 46 System subheader CM 4.6 46 System subheader CI 4.6 46 System subheader CO 5.6 Both ends; structural steel and dewpoint moisture monitor CM 5.6 Dewpoint moisture monitor and steel work CI 5.6 Dewpoint moisture monitor and ; teel work CO 6.6 Dewpoint moisture monitor and steel work CM 6.6 Dewpoint moisture monitor and steel work CI 6.6 Dewpoint moisture monitor and steelwork CO 7.6 Floor steel CO 10.6 46 System subheader CM 17.6 Next to load cell CM 18.6 System 23 pipe C0 19.6 Both ends; structural steel and no access CM 19.6 Next to load cell Dottom Crosshead Tendons BOLL 3 Both ends; floor steel and no access BILL 3 Floor steel and no access BIRL3 Both ends; floor steel and no access BORL3 Both ends; floor steel and no access BOLL 4 Floor steel BILL 4 Floor steel BIRL4 Floor steel BORL4 Both ends; floor steel and no access L

Pag 2 7 cf 21 Attachment 1 Tendons Not Accessible for Visual Inspection Vertical Tendons (TopHead)

VI-37 System 23 piping (Bottom Head) 70 anchor caps cannot be removed; see listing for specifics VI-2 Main steam pipe VM-2 Main steam pipe VI-3 System 46 pipe VI-4 System 46 pipe VM-4 System 46 pipe VI-5 Main steam pipe VM-5 Main steam pipe VI-6 System 11 pipe VM-6 System 46 pipe VI-7 CR insulation; hanger VM-7 CR insulation; System 46 pipe VO-7 CR insulation; System 46 pipe VI-8 System 46 pipe; FW insulation VM-8 System 46 pipe; FW insulation VI-9 Main steam pipe VM-9 Main steam pipe VI-10 Conduit; load cell VM-10 Conduit and 4 pipes VM-11 System 46 pipe VI-12 Main steam pipe VM-12 Main steam pipe VM-13 System 46 pipe and hanger VI-14 System 46 pipe; CR insulation; snubber VM-14 System 46 pipe; CR insulation V0-14 System 46 pipe; CR insulation VM-15 System 46 pipe; FW insulation VI-16 Main steam pipe VM-16 Main steam pipe VI-17 System 46 - 2 pipes VI-18 System 46 pipe; snubber VI-19 Main steam pipe VM-19 Main steam pipe VI-20 System 46 pipe; hanger; snubber VM-20 System 46 pipe; hanger; snubber VI-21 Feedwater pipe VM-21 Feedwater pipe; conduit V0-21 Feedwater pipe; conduit VI-23 Main steam pipe

Page 8 of 21

• Attachment 1 VM-23 Main steam pipe VM-25 System 46 pipe; snubber VI-26 Main steam pipe VM-26 Main steam pipe VI-27 System 46 pipe VM-27 System 46 pipe VI-28 System 46 pipe VM-28 System 46 pipe; conduit V0-28 System 46 pipe; str. steel VI-29 System 46 pipe hanger VM-29 System 46 pipe, 3 each VI-30 Main steam pipe VM-30 Main steam pipe VI-32 System 46 pipe VM-32 Snubber VI-33 Main steam pipe VM-33 Main steam pipe VI-35 System 46 pipe; CR insulation; conduit VM-35 System 46 pipe; CR insulation; conduit V0-35 Conduit VI-36 System 46 pipe and hanger VI-37 Main steam pipe VM-37 Main steat pipe VM-38 System A6 pipe and hanger VM-39 System 46 pipe VI-40 Main steam pipe VM-40 Main steam pipe VI-41 Pipe hanger; snubber VM-41 Pipe hanger VI-42 Pipe hanger; FW insulation VM-42 Pipe hanger; FW insulation V0-42 Pipe hanger; FW insulation Top Crosshead Tendons TOLU 1 System 46 valves HV-46253-1 & 2 TILU1 System 46 valves HV-46253-1 & 2 TIRU1 System 46 valves HV-46253-1 & 2 TILU2 System 46 subheader TOLM1 Platform steel -

TIRM1 Sharpy penetration TOLM2 Building steel

Page 9 of 21

• Attachment 1 Circumferential Tendons CI 17.1 SUC #2 (4" conduit)

CO 18.1 Ductwork C0 9.2 Structural steel C0 10.2 Both ends; floor steel at both ends CM 10.2 Floor steel CI 10.2 Floor steel C0 12.2 Structural steel C0 18.2 System 23 piping CM 18.2 System 23 piping CO 7.3 Floor steel CM 7.3 Floor steel CI 7.3 Floor steel CI 9.3 System 46 subheader and structural steel CM 1.4 Large System 22 pipe CM 2.4 Large System 22 pipe CO 11.4 Structural steel CI 11.4 Structural steel CI 18.4 Structural steel CO 7.5 ' Floor steel CM 7.5 System 25 pipe CI 7.5 System 25 pipe C0 10.5 Strv.cural steel CI 10.5 HV-46259-1 CO 18.5 System 46 subheader-C0 19.5 Both ends; structural steel CO 2.6 Floor steel CI 4.6 System 46 subheader CO 7.6 Floor steel C0 10.6 System 46 subheader Bottom Crosshead Tendons BOLL 4 Platform steel BILL 4 Platform steel BIRL4 Platform steel BORL4 Platform steel >

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TENDON SURVEILLANCE PROGRAM k

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Page 1 of 7 Attachment 2 Fort St. Vrain Technical Specifications Amendment No.

Page 5.2-1 Tendon Surveillance Program 1

Specification SR 5.2.2 - Tendon Corrosion and Anchor Assemblies Surveillance The serviceability of the corrosion protection applied to and the condition of the prestressing tendons shall be monitored in accordance with paragraphs a) and b).

Surveillance of the tendon end anchor assemblies shall be l performed in accordance with paragraph c). Lift off tests l provide assurance that the prestressing system has not been l degraded and will be done in accordance with paragraph d).

l Tendon surveillance reporting to the NRC will be done in l accordance with paragraph e).

l a) Sample wires shall be inserted into selected tendons l with areas of known corrosion. An accelerated l corrosion inspection program shall consist of

l. inspecting these wires in at least one longitudinal, l one bottom crosshead_and one top crosshead, or l- circumferential tendon at least once per 18 months.

.I 'SR 5.2.2.a shall be-implemented per ISI Criterion D.

L1 -

Page 2 of 7 l Attachment 2 j Fort St. Vrain Technical Specifications Amendment No.

Page 5.2-2 l b) A sample of the atmosphere contained in at least onc l longitudinal, circumferential, bottom crosshead and top l crosshead tendon tubes shall be drawn and analyzed for products of corrosion, in coordination with and at the same time intervals as for paragraph a) above.

SR 5.2.2.b shall be implemented per ISI Criterion D.

l l c) A visual examination of 5% of the accessible l prestressing anchor assemblies for the top crosshead l tendons and the circumferential tendons shall be l performed at least once per 18 months.

l A visual examination of at least 33% of the accessible l l prestressing anchor assemblies for the longitudinal l tendons and the bottom crosshead tendons shall be l' performed at least once per 18 months.

l One tendon from each of the above four groups may be l kept unchanged, the remaining tendons shall be selected l on a random but representative basis so that the entire l population of accessible tendons within the group are l- examined.

h

Page 3 of 7 Attachment 2 Fort St. Vrain Technical Specifications Amendment No.

Page 5.2-3 l The visual examinations of the prestressing anchor l assemblies.shall include examination of the assembly l hardware (such as the bearing plate, stressing washers, l shims, and buttonheads) and the surrounding concrete.

l The method used to remove the corrosion protection l grease to permit visual examination of the hardware l shall neither increase the effects of corrosion nor l damage the steel.

l SR 5.2.2.c shall be implemented per ISI Criterion D.

l d) A lift off test shall be performed on at least 5% of l the accessible top crosshead tendons and 5% of the l accessible circumferential tendons at least once in 18 l months.

l Lift off tests will be performed on 15% of the

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l accessible longitudinal, and 15% of the accessible l bottom crosshead tendons at least once per 18 months.

l One tendon from each group may be kept unchanged, the l remaining tendons shall be selected on a random basis l so that the entire population of accessible tendons l within the groups are examined. For a tendon

-l containing a load cell, reading the load cell is l equivalent to performing a lift off test.

u-

Page 4 of 7 Attachment 2 Fort St. Vrain Technical Specifications Amendment No.

Page 5.2-4 l As each tendon group displays acceptable lift off l loads, visual inspections, and corrosion sample wire l inspections in two consecutive 18 month surveillances, l the surveillance rate will change to every 3 years. If l the surveillances are acceptable in two successive 3 l year tests, then the surveillance rate will revert back l to once every 5 years. After two consecutive l acceptable 3 year surveillances, the visual inspection l of the accessible longitudinal and bottom crosshead l tendons will revert back to 5%. The lift off test for l each group shall be considered acceptable if the value l 1s above the maximum relaxation for the time period.

l Relaxation curves will be supplied later in the l official Technical Specification submittal.

l SR 5.2.2.d shall be implemented per ISI Criterion D.

l e) In addition to any other reports which may be required, l a special report describing the results of the tendon l examinations performed during the reporting period l shall be submitted to the NRC every 18 months.

SR 5.2.2.e shall be implemented per ISI Criterion-D.

E

- Page 5 of 7 Attachment 2 o

Fort St. Vrain i

Technical Specifications Amendment No.

Page 5.2-5 Basis for Specification SR 5.2.2 The corrosion protection provided for the PCRV prestressing components is considered to be more than adequate to assure that the required prestressing forces are sustained throughout the operational life of the plant. The details of the corrosion protection system are described in Section 5.6.2.5 of the FSAR.

Sampling tendon tube atmosphere for products will provide a secondar;y check on the adequacy of the corrosion protection provided for the stressing tendons.

l Visual and lift off examinations of tendon assemblies will provide additional assurance that the prestressing system has not degraded by checking the corrosion protection and

-l integrity of the anchor assemblies and tendon wires.

Y f

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Page 6 of 7 Attachment 2 s

Fort St. Vrain Technical Specifications Amendment No.

Page 5.2-6 Specification SR 5.2.3 - Tendon Load Cell Surveillance a) Checks on the possible shift in the load cell reference points for representative load cells shall be performed at the end of the first calendar year after initial prestressing and within 120 days prior to initial power operation. Additional checks shall be conducted at five calendar year intervals thereafter.

b) The load cell alarm circuit between the Data Acquisition System Room and the Control Room shall be functionally tested annually to assure that the operator in the Control Room is alerted when tendon load settings are exceeded.

SR 5.2.3.b shall be implemented per ISI Criterion A.

L

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Page 7 of 7 Attachment 2 o'

Fort St. Vrain Technical Specifications Amendment No.

Page 5.2-7 Basis for Specification SR 5.2.3 The PCRV tendons apply the force required to counteract the internal pressure. Therefore, they are the PCRV structural components most capable of being directly monitored and of indicating the capability of the vessel to resist internal pressures. Since the relation between effective prestress and internal pressure is directly and easily calculable, monitoring tendon loads is a direct and reliable means for assuring that the vessel always has capacity to resist pressurds up to Reference Pressure.

Monitoring of the tendon loads will assure that deterioration of structural components including progressive tendon corrosion, concrete strength reduction, excessive steel relaxation, etc., cannot occur undetected I

to a degree that would jeopardize the safety of the vessel.

! Each of these phenomena would result in tendon load

changes. These changes, as reflected by the load cells, are monitored in the control room by an alarm system which alerts the operator when the tendon load settings are

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exceeded. The upper settings will be varied depending on the location of the tendon being monitored, while the lower settings for all load cells will be set to correspond to 1.25 times peak working pressure (PWP).

l l

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